Screw fitting: 1/4" x 40 TPI. Pipe connection: 3mm.
Reversible control valve for steam engine model Screw fitting is 1/4 "X 40 TPI
Reversible Control Valve for Steam Engine Model P20
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
Microcosm P20 Brass Reversible Control Valve Compatible with Steam Engine Models
P20 Reversible Control Valve 1/4x40 TPI 3mm Pipe Steam Model
