Gaskets are sold separately

The 'A' suffix typically denotes a minor manufacturing revision that does not affect field installation or compatibility

While the demand cooling system manages internal temperatures through liquid injection

What is the difference between the K16BT-36 and the K16BT-36H

Watts 0386463 Valve 320788-703 Gaskets are sold separatelyThe Watts 0386463 (Series 911S M3) is a professional grade 1 2" boiler feed water pressure regulator and backflow preventer combo designed for high demand hydronic heating systems. Engineered for both commercial and residential boiler feed lines, this pre assembled unit combines the Model 9D dual check backflow preventer with the Model 1156F feed water pressure regulator into a single, compact bronze body. This integration simplifies installation and