Fixing on boiler is M6x0.75I threaded connector, took Screw fitting is 1/4 "X 40 TPI. Body Length 33mm, width 20mm.
P6 Metal Check Valves 1/4x40 Thread 3.5mm pipe for Mini Steam Models part Kit
P6 Check Valve 1/4x40 TPI 3.5mm Pipe M6x0.75 Boiler Thread
P6 Brass Check Valve – 1/4" x 40 TPI for Live Steam Boilers
P6 Brass Check Valve 1/4"x40TPI M6x0.75 for 3.5mm Pipe Steam Model
Microcosm P6 Brass Check Valve 1/4""x40TPI & 3.5mm Pipe for Steam Engine Boilers
