WATTS Valve 957ZRPDA 6"

Shut down the water system by closing both the inlet and outlet shutoff valves.

Open test cocks to relieve pressure within the backflow assembly.

Remove #3 test cock from housing.

Rotate the cover sleeve to break the sleeve O-ring seals and slide it to the downstream side of the housing.

Remove the stainless steel check retainer from the housing.

Remove the #1 check module by prying it toward the open zone.

Remove #2 check module using the same method as #1 check module.

Shut down water system by closing both the inlet and outlet shutoff valves

Relieve pressure within the assembly by opening the #2, #3, and #4 test cocks

Disconnect the hose from the bottom cover plate to the relief valve

Unscrew the relief valve from the housing

Remove the cover plate of the relief valve by removing the four connecting screws

Remove the rubber diaphragm from the relief valve

Push up on the piston until the piston shaft with the attached E-clip is exposed and remove the E-clip

Test No. 1 - Check Valve No. 2 Tightness

Ensure valves are in correct positions

Observe the pressure differential

Does the pressure differential continue to decrease until the vent opens?

Report check valve #2 as leaking if pressure differential continues to decrease

Test No. 2 - Shutoff #2 Tightness

Observe the pressure differential