Waterco Baker Vertilever Valve Piston Assembly (31B0005) valveparts SPST applications where the original SPST applications where the original switch has become unreliable or no longer behaves the way it should 9" heater length and specialized L shaped curved configuration should be matched to the original equipment requirements before installation The Waterco Baker Vertilever valve piston assembly is designed for compatible valve applications where the main moving piston section needs replacement The 31B0005 is a strong service part when a compatible Baker Vertilever valve needs its main internal working assembly renewed for better performance