AME 15100, Yamada calcium chlorine pump feature bolted construction, which eliminates leaks and simplifies post-maintenance reassembly. Bolted construction is superior to clamp band retainers, which frequently require frustrating, unnecessary leakage rebuilds from misalignment during reassembly. Inspection or maintenance of every Yamada air valve may be performed without removing the pump from service. Outside-accessible, making it easy to fix/inspect. The 15100 have Common-size air valve assemblies reduce parts confusion and inventory. Unique to the Yamada design is an individual modular pilot valve that actuates the air valve. It is depressed slightly by the inner center disk creating a pressure drop at one end of the air valve, allowing shifting to occur. It is maintenance free with no cumbersome snap rings or lubricated dynamic o-rings to replace or repair.