Made of corrosion-resistant steel, ZVI Valve Cages have large rounded ports which can be directly fastened to valve. ZVI Valve Cage-Integral features ZVI StraightFlo Valve and does not need to be removed during servicing, installation, or removal of valve from cylinder. ZVI Valve Cage-Removable can be used with ZVI SF Valve or with conventional valves. Based on Modular Reed Valve technology, SF Valve can be applied to all gas compression applications.