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Watts 957-OSY 4" Reduced Pressure Zone Backflow Preventer with - Watts RPZ Backflow Preventers
WattsWatts RPZ Backflow Preventers

Watts 957-OSY 4" Reduced Pressure Zone Backflow Preventer with

The Watts 957 Reduced Pressure Zone Backflow Preventer (MPN 957-OSY 4") is a flange-connected RPZ backflow preventer with a 4-inch pipe size. It features an OSY gate valve shut-off valve type and includes a flood…

SKU 3G-OTH-444390

Also listed as: 957OSY4 · 957 OSY 4 · 957-OSY-4

Brand
Watts
Item
957-OSY 4" Reduced Pressure Zone Backflow Preventer with
Part Number
957-OSY 4"
Category
Watts RPZ Backflow Preventers
Available to Order
Also known as:957-OSY 4"Watts
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Delivery
Worldwide DHL shipping from Singapore; 7–14 business days door-to-door for most destinations.
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Invoicing in USD. Bank transfer (SWIFT) and corporate PO accepted.

Technical Specifications

Watts
Manufacturer Part Number
957-OSY 4"
Type
with Flood Detection Sensor
Pipe Size
4 in
Connection Type
Flange
Shut-Off Valve Type
OSY Gate Valve

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Watts Products
3G Electric (S) Pte. Ltd. — Singapore

Product Description

The Watts 957 Reduced Pressure Zone Backflow Preventer (MPN 957-OSY 4") is a flange-connected RPZ backflow preventer with a 4-inch pipe size. It features an OSY gate valve shut-off valve type and includes a flood detection sensor.

Frequently Asked Questions

What is the Watts 957 Reduced Pressure Zone Backflow Preventer used for?

The Watts 957 RPZ backflow preventer is used to protect potable water supplies from cross-connection contamination in commercial, industrial, and municipal systems. Its 4-inch flange connection and OSY gate valve suit high-flow applications where backflow prevention is critical.

What are the specifications of the Watts 957 RPZ backflow preventer?

The Watts 957 RPZ backflow preventer (MPN 957-OSY 4") has a 4-inch pipe size, flange connection, and OSY gate valve shut-off. It includes a flood detection sensor. Watts is the OEM brand for this reduced pressure zone assembly.

Where to buy the Watts 957 RPZ backflow preventer worldwide?

3G Electric supplies the Watts 957 RPZ backflow preventer worldwide. As a global industrial equipment distributor, we handle full logistics, customs clearance, and delivery to your site. Contact us for availability and lead time.

How to install a Watts 957 RPZ backflow preventer?

Install the Watts 957 RPZ backflow preventer in a horizontal position with adequate clearance for testing and maintenance. Ensure flange connections are properly gasketed and torqued. Follow local plumbing codes and the manufacturer's instructions for the flood detection sensor wiring.

Used in

Common applications for Watts
Commercial plumbing – Watts standard capacity water pressure regulators (3/8 LF 26AB) for stabilizing incoming water pressure
Industrial steam systems – Watts 152A series steam pressure regulators for pressure reduction in process and heating lines
Cross-connection control – Watts 757 double check backflow preventers for commercial and industrial water supply protection
Boiler safety – Watts ASME Section XIII temperature and pressure relief valves for overpressure protection in heating systems
Hydronic heating – Watts CP16 pilot-operated pressure regulators for maintaining consistent pressure in steam or water loops
Water hammer mitigation – Watts LF15M2-A water hammer arrestors for absorbing surges in quick-closing valve applications
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Watts Products

3G Electric supplies Watts watts rpz backflow preventers. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.

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