Backflow Preventer, Dual Check Valve, .75-In. Tub & Shower Doors Keep your drains and traps

Keep your drains and traps running freely with a regular application of K-67

Initially designed for use in cold climates

This durable product will give many years of use

fully automatic charger/maintainer

Backflow Preventer, Dual Check Valve, .75-In. Tub & Shower Doors Keep your drains and traps3 4", back flo preventer, dual check valve, use at drinking water supply service entrance or individual outlets, for non health hazard residential water system containment & continuous pressure applications, install vertically or horizontally, temperature range 33 to 180 degrees Fahrenheit, minimum working pressure 10 psi to maximum working pressure 150 psi, buna n seals & stainless steel springs, meets asse 1023 & csa b64. 6, wetted surface of this