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Watts LF909-DOSY-FS Reduced Pressure Zone Backflow Preventer - Watts RPZ Backflow Preventers
WattsWatts RPZ Backflow Preventers

Watts LF909-DOSY-FS Reduced Pressure Zone Backflow Preventer

The Watts LF909 Large is a reduced pressure zone (RPZ) backflow preventer from the Watts RPZ Backflow Preventers product line. This assembly features a cast iron body with flange connections and includes an OSY gate…

SKU 3G-OTH-444411

Also listed as: LF909DOSYFS · LF909 DOSY FS

Brand
Watts
Item
LF909-DOSY-FS Reduced Pressure Zone Backflow Preventer
Part Number
LF909-DOSY-FS
Category
Watts RPZ Backflow Preventers
Available to Order
Also known as:LF909-DOSY-FSWatts
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Local availability & support — the Philippines

Delivery
5–8 business days door-to-door; Bureau of Customs clearance typically 2–4 business days.
Payment
Invoicing in PHP or USD. Bank transfer and corporate PO accepted.
Ships to
Manila, Quezon City, Cebu, Davao, Batangas

Technical Specifications

Watts
Manufacturer Part Number
LF909-DOSY-FS
Type
with Flood Detection Sensor, Cast Iron, Flange
Connection Type
Flange
Shut-Off Valve Type
OSY Gate Valve

Technical Documents

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3G Electric (S) Pte. Ltd. — Singapore

Product Description

The Watts LF909 Large is a reduced pressure zone (RPZ) backflow preventer from the Watts RPZ Backflow Preventers product line. This assembly features a cast iron body with flange connections and includes an OSY gate valve shut-off valve type. It is equipped with a flood detection sensor, as indicated by the manufacturer part number LF909-DOSY-FS.

Supplied to the Philippines — compatible with 60 Hz installations. DHL Express delivery to Manila, Quezon City, Cebu, customs and duties handled door-to-door.

Frequently Asked Questions

What is a Watts LF909 reduced pressure zone assembly used for?

The Watts LF909 RPZ assembly prevents backflow of contaminated water into potable water supplies. It is used in commercial, industrial, and municipal applications where high-hazard cross-connections exist, such as irrigation, boiler feed, and fire protection systems.

What are the specifications of the Watts LF909-DOSY-FS?

The Watts LF909-DOSY-FS is a large reduced pressure zone assembly with a cast iron body, flange connections, and an OSY gate valve shut-off. It includes a flood detection sensor. Connection type is flange. The manufacturer part number is LF909-DOSY-FS.

Where to buy a Watts LF909 backflow preventer worldwide?

3G Electric supplies the Watts LF909 reduced pressure zone assembly to customers worldwide. We handle full logistics, customs clearance, and delivery to your site. Contact us for pricing and lead time on this model with flood detection sensor.

How to install a Watts RPZ backflow preventer?

Install the Watts RPZ assembly in a horizontal position with adequate clearance for testing and maintenance. Ensure the relief valve is at least 12 inches above grade. Follow local plumbing codes and the manufacturer's instructions for proper orientation and support of the cast iron body.

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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