Lego Pneumatic Simplex pump

Single cylinder piston pumps were used in all kinds off steamplants. This lego Pneumatic version is driven by air at a presure of 1 bar. The cylinder units in and outlets have been drilled out for larger air/water flow, the pneumatic switches are not modified. For suction and discharge valves of the pumpcylinder I used old pneumatic distribution blocks (part 4692) You can find building instructions here: https://bricksafe.com/pages/Hans56/si...