This is a compression union with an olive for mounting our 6mmFan Thermostat (part no: #STAT) probe
into a female 1/8" NPT thread.
It is brassand has an 1/8" NPT male thread.
11mm and 12mm hex threads
30mm long.
Can be used as a compression fitting for other 1/4" or 6mm diameter copper or steel tube.
Bottom picture shows probe on union for illustration. PROBE NOT INCLUDED
1/8" NPT THERMOSTAT PROBE UNION #STATUN2