Screw fitting is 1/4 X 40 TPI. Pressure(in psi) is it designed to run at (about 10-50psi). Pipeline appropriate 3MM or 4MM. Its structure is quite compact, The compact V-twin, reducing the vertical dimension.
Throttle switch connected oil cups intermediate layout switching valves. And control the speed in both directions. Made of metal carefully made of brass. Base increase the performance of two stainless steel bearings enhanced engine. Use stainless steel hex screws, engine seems more retro.This is one of a series of Q steam engines. Notification will be sent to buyers.