The Johnson Controls D-251-6003 is a high-performance replacement diaphragm specifically engineered for pneumatic actuator maintenance and repair

specifically optimized for R-410A systems commonly found in modern York and Johnson Controls equipment

This float is suitable for all operating pressures supported by the compatible trap bodies

contains activated alumina for acid removal

the E9-16 is technically identical to and interchangeable with HK-E9-16 and HKN-E9-16 part numbers

Lochinvar & A.O. Smith 100163257 Bypass Assembly 322056-301 The Johnson Controls D-251-6003 isThe Lochinvar & A. O. Smith 100163257 Bypass Assembly is a critical OEM component engineered for precise flow management in high efficiency pool and spa heating systems. Built to withstand the rigorous demands of commercial and residential hydronic applications, this 1 2" NPT bypass kit ensures optimal heat exchanger performance by regulating water velocity and preventing thermal shock. This assembly is a direct replacement part designed specifically