17L Pressure Reducing Reservoir Railway Pressure Reduce Tank Pressure Reducing Air Cylinder Product Overview The 17L Pressure Reducing Reservoir , also known as railway pressure reduce tank and pressure reducing air cylinder, is a core pressure regulating component specially designed for traditional GK triple valve brake systems of railway freight wagons, including old-type covered wagons and open-top wagons. Cooperating with the empty-load cut-out cock and empty-load