Plumbing · P-SJZ8N

Main Water Supply Reduced Pressure Backflow Preventer Detail

Materials

Elements

Stairs Floors / Slabs Millwork / Casework Connections / Plates

About this detail

A reduced pressure backflow prevention assembly connects to a main water supply line in this installation. The assembly comprises a meter box and meter assembly, schedule 80 PVC, red brass or copper piping, ball valve shut-offs, and an approved reduced pressure backflow assembly sized to match the meter. Concrete thrust blocks support the 90-degree brass elbows, while a minimum 4-inch thick by 18-inch wide concrete slab supports the above-ground enclosure. Unions and a pressure reducing valve are integrated into the piping run as required by system parameters and local notes. All underground piping and riser elbows must use type L or M copper or red brass, with warning and identification tape installed above.

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