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Watts LF709-OSY Double Check Backflow Preventer, 2 1/2 in, Flange x Flange - Watts Double Check Backflow Preventers
WattsWatts Double Check Backflow Preventers

Watts LF709-OSY Double Check Backflow Preventer, 2 1/2 in, Flange x Flange

The WATTS Double Check Valve Assembly: LF709 is a Watts Double Check Backflow Preventer featuring a flange x flange connection and an OSY gate valve shut-off valve type. This model, with manufacturer part number…

SKU 3G-OTH-434576

Also listed as: LF709OSY · LF709 OSY

Brand
Watts
Item
LF709-OSY Double Check Backflow Preventer, 2 1/2 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
Overall Lg
39.44 in
Pipe Size
2 1/2 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 Double Check Valve Assembly: LF709 is a Watts Double Check Backflow Preventer featuring a flange x flange connection and an OSY gate valve shut-off valve type. This model, with manufacturer part number LF709-OSY, has a 2 1/2 inch pipe size and an overall length of 39.44 inches.

Frequently Asked Questions

What is the Watts LF709 double check valve assembly used for?

The Watts LF709 double check valve assembly is used to prevent backflow of non-potable water into potable water supplies in commercial and industrial plumbing systems. It is suitable for low-hazard cross-connections and is commonly installed in irrigation, fire sprinkler, and water main applications.

What are the specifications of the Watts LF709-OSY backflow preventer?

The Watts LF709-OSY double check valve assembly has a 2 1/2 in pipe size, flange x flange connection, and an overall length of 39.44 in. It features an OSY gate valve shut-off type and is manufactured by Watts under part number LF709-OSY.

Where to buy the Watts LF709 double check valve assembly worldwide?

3G Electric supplies the Watts LF709 double check valve assembly 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 on this Watts backflow preventer.

How to install a Watts double check valve assembly?

Install the Watts double check valve assembly in a horizontal or vertical position with flow direction matching the arrow on the body. Ensure adequate clearance for maintenance and testing. Flange connections require proper gaskets and bolting per local plumbing codes. Always consult the manufacturer's installation manual.

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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