Automotive Unions and Connectors for Coolant, Fuel and Heater Hoses

Browse our range of high-quality aluminium and nylon unions designed to connect coolant, fuel, and heater hoses. This collection includes straight, 90°, and T-piece connectors in a variety of sizes — perfect for reliable plumbing in engine bays, heating systems and fuel lines.

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Latest Products

3 Fuse And Relay Holder 60mm - Car Builder Solutions3 Fuse And Relay Holder 60mm - Car Builder Solutions

3 Fuses Relay and Holder

Here’s a unique little accessory that’ll made adding additional circuits easy peasy. It’s a single moulding that accepts a single relay and three blade type fuses. Size 60mm x 33mm x 45mm high. Two or more can be locked together. All terminals included. FUSE...
£5.40
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Smiths GPS Speed Sensor – Universal Compatibility for Electronic Speedometers

Smiths GPS Speed Sensor – Universal Compatibility for Electronic Speedometers

Compact GPS Speed Sensor compatible with all Smiths electronic speedometers and devices that accept a pulsed input. Features real-time LED indicators, fast GPS lock, and low-power standby mode for quick starts. Ideal for classic cars, custom builds, and more.
£170.40
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Smiths Classic Water Temperature Gauge - Magnolia Face - Chrome Bezel

Smiths Classic Water Temperature Gauge - Magnolia Face - Chrome Bezel

Monitor coolant temperature (50-140°C) with this classic Smiths 52mm electric gauge. Features magnolia dial, chrome bezel, and illumination.
£59.00
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Karcher Spray-extraction cleaner Puzzi 10/1 Upholstery Vacuum CleanerKarcher Spray-extraction cleaner Puzzi 10/1 Upholstery Vacuum Cleaner

Karcher Spray-extraction cleaner Puzzi 10/1 Upholstery Vacuum Cleaner

Professional carpet and upholstery cleaner for deep, hygienic results. The Kärcher Puzzi 10/1 offers powerful suction, fast drying, and reliable performance—perfect for vehicles, offices, and commercial cleaning.
£498.00
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Karcher Wet and dry vacuum cleaner NT 20/1 Me ClassicKarcher Wet and dry vacuum cleaner NT 20/1 Me Classic

Karcher Wet and dry vacuum cleaner NT 20/1 Me Classic

Compact and powerful wet & dry vacuum with a 20L stainless steel tank. Ideal for workshops, garages, and professional cleaning tasks.
£130.00
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Karcher HD 5/12 CX Plus 240v Pressure WasherKarcher HD 5/12 CX Plus 240v Pressure Washer

Karcher HD 5/12 CX Plus 240v Pressure Washer

Efficient and portable, the Kärcher HD 5/12 CX Plus is a compact high-pressure washer with hose reel, EASY!Force gun, and vertical/horizontal operation.
£778.80
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Aluminium Header / Expansion -/ Overflow Tank Rectangular 1 LtrAluminium Header / Expansion -/ Overflow Tank Rectangular 1 Ltr

Aluminium Header / Expansion -/ Overflow Tank Rectangular 1 Ltr

1 ltr capacity. Overall size 170mm wide. 75mm front to back. 182mm high.
£81.60
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Aluminium Expansion Tank RoundAluminium Expansion Tank Round

Aluminium Expansion Tank Round

800ml capacity. Overall size 215mm high. 90mm Dia.
£81.60
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£81.60
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Battery Terminal Fuse Box and Earth BusBattery Terminal Fuse Box and Earth Bus

Battery Terminal Fuse Box and Earth Bus

40 Amp. Just bolt this 4 way fuse box and earth busbar to your positive and negative battery terminals for quick and simple power distribution. Size 55mm x 45mm x 30mm high. Four fuses, ring terminals and snap-on covers included. NOTE: Battery terminals not...
£18.00
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Twin Cable Throttle Pedal Conversion KitTwin Cable Throttle Pedal Conversion Kit

Twin Cable Throttle Pedal Conversion Kit

Twin Cable Throttle Pedal Conversion Kit
£9.60
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13 Piece 10 lb Slide Hammer / Dent Puller Kit13 Piece 10 lb Slide Hammer / Dent Puller Kit

13 Piece 10 lb Slide Hammer / Dent Puller Kit

13 Piece 10 lb slide hammer / dent puller kit
£43.20
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9 Piece 5 lb Slide Hammer / Dent Puller Kit9 Piece 5 lb Slide Hammer / Dent Puller Kit

9 Piece 5 lb Slide Hammer / Dent Puller Kit

9 Piece 5 lb slide hammer / dent puller kit
£15.60
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Smiths Pressure Transducer - Pressure Sender

Smiths Pressure Transducer - Pressure Sender

Genuine Smiths Smiths Oil pressure sender to suit Smiths Classic electrical gauges. Has 1/8NPT thread. This Smiths Classic Pressure sender measures 52mm diameter by 40mm in height (not including the thread or electrical connector).
£82.00
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Smiths Water Temperature Sender Unit

Smiths Water Temperature Sender Unit

Genuine Smith
£21.00
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£21.00
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Smiths Analogue Time Clock Black / Magnolia FaceSmiths Analogue Time Clock Black / Magnolia Face
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Smiths Analogue Time Clock Black / Magnolia Face

Add authentic Smiths heritage to your classic car with this elegant 52mm magnolia dial time clock (12V).
£107.00
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Smiths Classic Mechanical 52mm Oil Pressure Gauge 1/2 Round Chrome Bezel - Magnolia FaceSmiths Classic Mechanical 52mm Oil Pressure Gauge 1/2 Round Chrome Bezel - Magnolia Face

Smiths Classic Mechanical 52mm Oil Pressure Gauge 1/2 Round Chrome Bezel - Magnolia Face

Authentic Smiths Classic 52mm mechanical oil gauge with iconic magnolia dial, 70psi range, and chrome bezel for vintage dashboards.
£94.00
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Smiths Classic Mechanical 52mm Oil Pressure Gauge 1/2 Round Chrome Bezel - Black FaceSmiths Classic Mechanical 52mm Oil Pressure Gauge 1/2 Round Chrome Bezel - Black Face

Smiths Classic Mechanical 52mm Oil Pressure Gauge 1/2 Round Chrome Bezel - Black Face

Monitor engine vitals accurately with this authentic Smiths Classic 52mm mechanical oil pressure gauge featuring a 70psi range.
£94.00
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Smiths Classic 80mm Digital Tachometer – 1/2 Round Chrome Bezel - Black FaceSmiths Classic 80mm Digital Tachometer – 1/2 Round Chrome Bezel - Black Face

Smiths Classic 80mm Digital Tachometer – 1/2 Round Chrome Bezel - Black Face

Authentic Smiths classic style meets modern digital accuracy. This 80mm, 7,000 RPM tachometer features a chrome bezel and suits 4/6/8 cylinder engines.
£194.00
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Smiths Classic 80mm Tachometer - 1/2 Round Chrome Bezel - Magnolia FaceSmiths Classic 80mm Tachometer - 1/2 Round Chrome Bezel - Magnolia Face

Smiths Classic 80mm Tachometer - 1/2 Round Chrome Bezel - Magnolia Face

Experience timeless British style with the Smiths Classic 80mm Tachometer. Features adjustable settings, chrome bezel, and modern electronic accuracy for 12V systems.
£204.00
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Smiths Classic 52mm Electronic Tachometer - 1/2 Round Chrome Bezel - Magnolia FaceSmiths Classic 52mm Electronic Tachometer - 1/2 Round Chrome Bezel - Magnolia Face

Smiths Classic 52mm Electronic Tachometer - 1/2 Round Chrome Bezel - Magnolia Face

Classic Smiths 52mm electronic tachometer blends vintage looks with modern, adjustable accuracy for 4, 6, or 8-cylinder engines.
£177.00
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Engine Oil

MOBIL Mobil 1 0W-20 Advanced Full Synthetic Engine OilMOBIL Mobil 1 0W-20 Advanced Full Synthetic Engine Oil
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MOBIL Mobil 1 0W-20 Advanced Full Synthetic Engine Oil

Advanced full synthetic 0W20 motor oil. Optimised for fuel economy and long-lasting engine protection in hybrid vehicles.
£13.96
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£13.96
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CASTROL EDGE 5W-40 Fully Synthetic Engine OilCASTROL EDGE 5W-40 Fully Synthetic Engine Oil
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CASTROL EDGE 5W-40 Fully Synthetic Engine Oil

Advanced full synthetic engine oil for maximum performance and protection. Improves fuel economy and exceeds industry standards.
£13.96
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MOBIL Super 1000 X1 15W-40 Engine OilMOBIL Super 1000 X1 15W-40 Engine Oil
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MOBIL Super 1000 X1 15W-40 Engine Oil

High-performance 15W40 motor oil. Provides excellent engine cleanliness, high-temperature protection, and wear protection. Suitable for various vehicles.
£7.96
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CASTROL EDGE 0W-30 A5/B5 Engine OilCASTROL EDGE 0W-30 A5/B5 Engine Oil
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CASTROL EDGE 0W-30 A5/B5 Engine Oil

Advanced 0W-30 motor oil boosts engine performance and fuel economy. Trusted by experts for ultimate protection and efficiency.
£13.96
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MOBIL Super 2000 X1 10W-40 Engine OilMOBIL Super 2000 X1 10W-40 Engine Oil
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MOBIL Super 2000 X1 10W-40 Engine Oil

High-performance 10W40 motor oil offering superior engine protection, sludge prevention, and cleanliness. Meets various industry standards.
£7.96
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CASTROL Transmax Manual FE 75W Gear Oil - 1L

CASTROL Transmax Manual FE 75W Gear Oil - 1L

High-performance 75W gear oil offering fuel economy, wear protection, and smooth shifting. Suitable for Ford, Volvo, and MB vehicles.
£19.96
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CASTROL CLASSIC Classic TQF Automatic Transmission Fluid - 20L
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CASTROL CLASSIC Classic TQF Automatic Transmission Fluid - 20L

Classic TQF Automatic Transmission Fluid. Ideal for classic cars. 20L. For automatic transmissions & power steering. Dyed red for easy identification.
£282.95
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CASTROL GTX 5W-30 RN17 Engine OilCASTROL GTX 5W-30 RN17 Engine Oil
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CASTROL GTX 5W-30 RN17 Engine Oil

5W-30 RN17 engine oil. Superior sludge protection and advanced viscosity and thermal breakdown protection. Extends engine life.
£42.95
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£42.95
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  • Brass 3/8" UNF Single Male Brake Union - Car Builder SolutionsBrass 3/8" UNF Single Male Brake Union - Car Builder Solutions

    Brass 3/8" UNF Single Male Brake Union

    Durable brass brake union for 3/16" tubing, 3/8" UNF male thread, 17mm length. Secure and reliable connection.
    £1.20
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    £1.20
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  • Brass Brake T Piece M10 x 1 - Car Builder SolutionsBrass Brake T Piece M10 x 1 - Car Builder Solutions

    Brass Brake T Piece M10 x 1

    A reliable brass brake T-piece with concave seats, 9.5mm thread depth, and a 6.5mm mounting hole for secure connections.
    £9.00
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    £9.00
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  • Brass Brake T Piece 3/8" UNF - Car Builder SolutionsBrass Brake T Piece 3/8" UNF - Car Builder Solutions

    Brass Brake T Piece 3/8" UNF

    Durable Brass Brake T-Piece with 3/8" UNF threads, concave seats, and a 1/4" mounting hole.
    £9.00
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    £9.00
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  • Brass M10 x 1 Single Male Brake Union - Car Builder SolutionsBrass M10 x 1 Single Male Brake Union - Car Builder Solutions

    Brass M10 x 1 Single Male Brake Union

    A durable brass brake union for 3/16" tubing, ensuring secure and leak-free brake connections. Easy to install and built to last.
    £1.20
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    £1.20
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  • Brass 3/8" UNF Single Female Brake Union - Car Builder SolutionsBrass 3/8" UNF Single Female Brake Union - Car Builder Solutions

    Brass 3/8" UNF Single Female Brake Union

    A durable brass 3/8" UNF single female brake union, ideal for 3/16" brake tubing. Ensures a secure and leak-free connection for optimal braking performance.
    £1.80
    £0.00
    £1.80
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  • 3/8" UNF Male Unions - Car Builder Solutions3/8" UNF Male Unions - Car Builder Solutions

    3/8" UNF Male Unions Pack of 10

    Durable steel 3/8" UNF male unions for 3/16" copper/nickel pipe. 11mm hex, 16mm thread length. Pack of 10.
    £4.20
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    £4.20
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  • Brass 7/16" Male Union for 3/16" Pipe - Car Builder Solutions

    Brass 7/16" Male Union for 3/16" Pipe

    Durable brass male union for joining 3/16" copper/nickel pipe securely. 7/16" thread, 16mm depth.
    £1.80
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    £1.80
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  • Brass M10 x 1 Male Blanking Plug - Car Builder SolutionsBrass M10 x 1 Male Blanking Plug - Car Builder Solutions

    Brass M10 x 1 Male Blanking Plug

    Brass blanking plug for sealing M10 x 1 female unions. Durable construction with a 17mm thread length for secure fastening.
    £2.40
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    £2.40
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  • Brass M10 x 1 Bulkhead Brake Union - Car Builder Solutions

    Brass M10 x 1 Bulkhead Brake Union

    Brass bulkhead brake union, connects copper brake pipe to flexible hoses at chassis, M10 x 1 half nut included, male flares, 48mm length.
    £7.80
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    £7.80
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  • Brass M10 x 1 Metric Female Blanking cap - Car Builder Solutions

    Brass M10 x 1 Metric Female Blanking cap

    Brass blanking cap seals unused M10 x 1 male ports. Prevents leaks, protects ports, ensures system integrity. Durable and easy to install.
    £2.40
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    £2.40
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  • Brass 3/8" UNF Male Blanking Plug - Car Builder SolutionsBrass 3/8" UNF Male Blanking Plug - Car Builder Solutions

    Brass 3/8" UNF Male Blanking Plug

    Solid brass blanking plug for sealing unused 3/8" UNF female ports with a secure, leak-proof closure.
    £1.80
    £0.00
    £1.80
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  • Brass Brake 4 Way 3/8" UNF - Car Builder SolutionsBrass Brake 4 Way 3/8" UNF - Car Builder Solutions

    Brass Brake 4 Way 3/8" UNF

    Durable brass 4-way brake tee with 3/8" UNF threads, concave seats, and precise measurements for secure braking performance.
    £12.00
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    £12.00
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  • 3/8" UNF Female Brake Unions - Car Builder Solutions3/8" UNF Female Brake Unions - Car Builder Solutions

    3/8" UNF Female Brake Unions Pack Of 10

    Pack of 10 plated steel brake unions. 3/8" UNF thread, fits 3/16" copper/nickel pipe. 17.5mm long, 13mm hex. Concave seat.
    £4.20
    £0.00
    £4.20
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  • Stainless Steel M10 x 1 Male Brake Union - Car Builder SolutionsStainless Steel M10 x 1 Male Brake Union - Car Builder Solutions

    Stainless Steel M10 x 1 Male Brake Union

    Durable stainless steel M10 x 1 male brake union for 3/16" pipe. Secure, leak-free connection for braking systems.
    £4.32
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    £4.32
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  • Brass 3/8 UNF Bulkhead Brake Union - Car Builder Solutions

    Brass 3/8" UNF Bulkhead Brake Union

    Brass bulkhead brake union for connecting brake pipes to flexible hoses. 3/8" UNF thread, includes brass half nut. 48mm length.
    £7.80
    £0.00
    £7.80
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  • Brass M10 x 1 Single Female Brake Union - Car Builder SolutionsBrass M10 x 1 Single Female Brake Union - Car Builder Solutions

    Brass M10 x 1 Single Female Brake Union

    Brass brake union for 3/16" tubing. Secure, leak-free connection. 17mm long, 11mm thread depth. M10 x 1 female thread.
    £1.80
    £0.00
    £1.80
    (-0%)
  • Brass Brake 4 Way M10 x 1 - Car Builder SolutionsBrass Brake 4 Way M10 x 1 - Car Builder Solutions

    Brass Brake 4 Way M10 x 1

    A durable brass brake 4 way union with concave seats, an 11.5mm thread depth and 6.5mm mounting hole for secure brake connections.
    £15.00
    £0.00
    £15.00
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  • Brass 7/16" Male Union For 1/4 Pipe - Car Builder SolutionsBrass 7/16" Male Union For 1/4 Pipe - Car Builder Solutions

    Brass 7/16" Male Union For 1/4 Pipe

    Durable 7/16" brass male union, ideal for 1/4" copper/copper-nickel pipe. Secure, leak-free connection for plumbing/heating.
    £1.80
    £0.00
    £1.80
    (-0%)
  • Brass Union 1/8" NPT male to M10 x 1mm female - Car Builder SolutionsBrass Union 1/8" NPT male to M10 x 1mm female - Car Builder Solutions

    Brass Union 1/8" NPT male to M10 x 1mm female

    Brass adaptor providing secure connection between 1/8" NPT male and M10 x 1mm female threads. Durable, reliable and easy to install.
    £5.40
    £0.00
    £5.40
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  • Brass Union 3/8" UNF Male to 7/16" UNF Female

    Brass Union 3/8" UNF Male to 7/16" UNF Female

    Brass union adapting 3/8" UNF male to 7/16" UNF female for plumbing and automotive applications.
    £9.00
    £0.00
    £9.00
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  • 7/16" UNF Female Brass Union with 8mm Hosetail - Car Builder Solutions7/16" UNF Female Brass Union with 8mm Hosetail - Car Builder Solutions

    7/16" UNF Female Brass Union with 8mm Hose Tail

    Brass union for brake fluid reservoirs, 7/16" UNF female thread with 8mm hose tail. Durable and easy to install.
    £10.20
    £0.00
    £10.20
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  • Brass Union 7/16" UNF MALE to 3/8" UNF Female - Car Builder SolutionsBrass Union 7/16" UNF MALE to 3/8" UNF Female - Car Builder Solutions

    Brass Union 7/16" UNF MALE to 3/8" UNF Female

    Concave seat in female end.
    £9.00
    £0.00
    £9.00
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  • Stainless Steel 3/8" UNF Male Brake Union - Car Builder SolutionsStainless Steel 3/8" UNF Male Brake Union - Car Builder Solutions

    Stainless Steel 3/8" UNF Male Brake Union

    Durable stainless steel 3/8" UNF male brake union for 3/16" copper/nickel brake pipe. Secure, leak-free connection. 21.5mm length.
    £4.32
    £0.00
    £4.32
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  • In-Line Connector 3/8" UNF Female to 3/8" UNF Female - Car Builder Solutions

    In-Line Connector 3/8" UNF Female to 3/8" UNF Female

    Solid brass 3/8" UNF female connector union, ideal for various plumbing applications. Durable and reliable.
    £3.60
    £0.00
    £3.60
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  • In-Line Connector M10 Female - Car Builder Solutions

    In-Line Connector M10 Female

    M10 female in-line connector, secure, reliable, leak-free, easy installation. Perfect for various applications.
    £1.80
    £0.00
    £1.80
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