Oil pressure release valve, crankcase. Made by SRM uk.
BSA A7, A10, A50, A65, B50
BSA B44 (Year dependant)
Triumph 6T, 5T, 3TA, 5TA, TR5T, T100, T110, T120, T140, TR6, TR7
Ariel Huntmaster
Part Number: 71-2370
SRM: Our Oil valves are made so the threads are on the upper tolerance to ensure good seal in the crankcase between the oil pressure cavity and the blow off hole , many oil valves on the market have threads made undersize and oil pressure is lost between the threads.