Pipe Connection: Pipe connection for the 3MM. he main hole is 3.5MM. Replacing valves on older steam engines may require soldering skills.
P20 Reversible Control Valve for Steam Engine Models – 1/4 x 40 TPI
P20 Reversible Control Valve for Steam Engine Model 1/4" X 40 TPI Hole 3.5MM
P20 Reversible Control Valve 1/4x40 TPI 3mm Pipe Steam Model
Mini Steam Engine Kit Brass Brass Steam Bell Whistle for Live Steam Models MW-6
Mini Steam Engine Kit Brass Steam Bell Whistles for Live Steam Models Set MW5
Large Brass Steam Whistle 1/4"x40TPI for Live Steam Engines, Vintage Sound Effec
