This universal interchangeable hub is optimized for 3-blade

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

For liquid lines

featuring silver-cadmium oxide contacts that prevent pitting and extend service life under high-cycling inductive loads

Lochinvar & A.O. Smith 100163257 Bypass Assembly 322056-301 This universal interchangeable hub 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