Plumbing · C-HTBY2

Backflow Preventer Shoe Valve Installation Detail

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A below-grade backflow preventer installation utilizes a shoe valve body, flapper assembly, insert pipe, and riser pipe located eighteen to thirty-six inches from the building foundation. Transition bushings from Schedule 40 to SDR 35 are required when connecting to SDR 35 side sewer piping. The assembly terminates at grade within a cast iron ring and locking cover or traffic-bearing meter box. A threaded adapter with a threaded plug is installed below grade alongside the riser.

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