Watts RK 957/957RPDA-RC4 8 RPZ Backflow Preventer

The Watts RK 957/957RPDA-RC4 8 is a genuine relief valve rubber parts kit for 8" 957 / 957RPDA reduced pressure zone (RPZ) backflow preventers. It features a silicone seat.

This 8 inch relief valve rubber parts kit includes the parts necessary to repair or replace the relief valve rubber parts of series 957, reduced pressure zone assembly, or reduced pressure detector assembly, series 957RPDA. This kit consists of all rubber parts necessary to repair the relief valve of the applicable valve. All parts are genuine and original to the valve.

Features

• Factory replacement kit
• No special tools required for changing parts
• All parts are made of high quality materials
• Original parts insure long service life

Common Questions

Will this kit fit my valve?

The RK 957/957RPDA-RC4 8 fits the 8" size of Watts series 957 / 957RPDA. Kits are size- and series-specific, so match the model stamped on your valve body or cover before ordering.

What's included in this kit?

This is a relief valve rubber parts kit — it carries the factory parts for that subassembly only, not a whole-valve rebuild. See the Watts spec sheet for the exact part breakdown.

Are these genuine Watts parts?

Yes. This is the factory RK 957/957RPDA-RC4 8 kit built with genuine Watts OEM components. Aftermarket parts can void your assembly approval and are commonly rejected by inspectors at annual test time.

My relief valve failed the test — is this the right kit?

Yes. A relief valve that opens late, weeps continuously or fails to open is a relief valve fault, and this relief valve rubber parts kit carries those parts for 957 / 957RPDA. If the checks also failed, a total repair kit rebuilds every subassembly at once.

Specifications

• Type: RPZ
• Seat / Seal Material: Silicone
• Country of Origin: United States
• Warranty: 1 Year Limited
• MPN: RK 957/957RPDA-RC4 8
• Lead-Free: No
• Product Role: repair_kit
• Kit Type: Relief Valve Rubber Parts Kit
• Fits Brand: Watts
• Fits Valve Series: 957;957RPDA
• Fits Valve Size: 8"
• Used With: 8" 957;8" 957RPDA
• Watts Ordering Code: 0899222
• Genuine OEM Parts: Yes