Caleffi 573503A 3/4" NPT female Inlet/Outlet Dual Check Backflow Preventer Size_1-7/8 1/4''SL (6 mm) Single-End Blade

1/4''SL (6 mm) Single-End Blade

As a bonus

Possessing the same accuracy and reliability of the BluVac+ Pro gauge

Renews System for R-22 Drop-Ins

Inlet connection: 3/4 in

Caleffi 573503A 3/4" NPT female Inlet/Outlet Dual Check Backflow Preventer Size_1-7/8 1/4''SL (6 mm) Single-End BladeCaleffi 573503A 3 4" NPT Female Inlet Outlet Dual Check Backflow Preventer Dual check continuous pressure backflow preventer with atmospheric vent. DZR low lead brass body. Max working pressure: 175 psi Working temp range: 32 210F Emergency backpressure temp: 250F Compliance with the following codes: IPC, IRC and UPC for use in accordance with the U. S. and Canadian plumbing codes Compliance with the following standards: ASSE 1012 2009 NSF ANSI 372