Caleffi 573009A 1/2" SWT Backflow Preventer with Autofill

This valve fills 50 percent faster than other valves There are no levers to flip or valve to close Pre calibration the autofill features a pressure setting indicator Anti scale materials the central housing containing the moving parts and the internal compensating spindle are made of a low adhesion coefficient plastic Diaphragm seat seal the useful working surface of the diaphragm is particularly large in order to maintain stable pressure in a system at a preset value regardless of inlet pressure variations Removable filter cartridge the cartridge containing the operating mechanisms, protected by a large surface area strainer is removable Fast filling the autofill fast fills the system to set pressure up to 5-1/2 GPM filling rate then automatically shuts off the water feed