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Watts LF709-OSY Double Check Backflow Preventer, 3 in, Flange x Flange - Watts Double Check Backflow Preventers
WattsWatts Double Check Backflow Preventers

Watts LF709-OSY Double Check Backflow Preventer, 3 in, Flange x Flange

The Watts LF709 Double Check Valve Assembly (SKU 3G-OTH-434581) is a 3-inch pipe size backflow preventer with flange x flange connections and an OSY gate valve shut-off. This model, part number LF709-OSY, measures…

SKU 3G-OTH-434581

Also listed as: LF709OSY · LF709 OSY

Brand
Watts
Item
LF709-OSY Double Check Backflow Preventer, 3 in, Flange x Flange
Part Number
LF709-OSY
Category
Watts Double Check Backflow Preventers
Available to Order
Also known as:LF709-OSYWatts
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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
LF709-OSY
Type
Flange x Flange, 709
Overall Lg
40.44 in
Pipe Size
3 in
Connection Type
Flange x Flange
Shut-Off Valve Type
OSY Gate Valve

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

Product Description

The Watts LF709 Double Check Valve Assembly (SKU 3G-OTH-434581) is a 3-inch pipe size backflow preventer with flange x flange connections and an OSY gate valve shut-off. This model, part number LF709-OSY, measures 40.44 inches in overall length and is designed for industrial backflow prevention applications.

Frequently Asked Questions

What is the Watts LF709 Double Check Valve Assembly used for?

The Watts LF709 Double Check Valve Assembly is used for industrial backflow prevention, protecting potable water supplies from contamination in cross-connection scenarios. It is suitable for low-hazard applications where a double check valve is required, such as in commercial or municipal water systems.

What are the specifications of the Watts LF709 Double Check Valve Assembly?

The Watts LF709 Double Check Valve Assembly has a 3-inch pipe size, flange x flange connections, and an OSY gate valve shut-off. It measures 40.44 inches in overall length and is model LF709-OSY. The Watts brand ensures reliable backflow prevention for industrial systems.

Where to buy the Watts LF709 Double Check Valve Assembly worldwide?

You can source the Watts LF709 Double Check Valve Assembly worldwide through 3G Electric, a global industrial equipment distributor. We handle full logistics, customs clearance, and delivery to your location. Contact us for availability and lead time on this backflow preventer.

How to install the Watts LF709 Double Check Valve Assembly?

Install the Watts LF709 Double Check Valve Assembly in a horizontal or vertical position with flow direction matching the arrow on the body. Ensure flange connections are properly gasketed and bolted. Follow local plumbing codes and the manufacturer's instructions for testing and maintenance.

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 double check 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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