Caleffi 535051A Boiler Feed Auto Filling Valve 3/4" NPT

The Caleffi 535051A Boiler Feed Auto Filling Valve stays open to keep water pressure right where it needs to be in hydronic heating systems. With a 3/4" NPT connection, this part fills water automatically and accurately to maintain pressure without drops, keeping the system running smoothly. This valve helps maintain better water pressure for boilers and radiant heating systems without needing to adjust it manually. Its high quality build lasts longer, and its working system cuts down manual work, stopping equipment damage from pressure being too high or too low.