Send a part number, a photo, or a whole BOM — we supply it and stand behind it. Worldwide shipping to 80+ countries.

3G Electric
RFQ CartGet a QuoteSign inSign up
Watts Backflow Preventer: LF7R, 3/4 in Pipe Size, True Union FNPT, 15.5 gpm Flow Rate - Potable Water Dual Check Backflow Preventers
WattsPotable Water Dual Check Backflow Preventers

Watts Backflow Preventer: LF7R, 3/4 in Pipe Size, True Union FNPT, 15.5 gpm Flow Rate

The WATTS LF7R is a potable water dual check backflow preventer with a 3/4 in pipe size and True Union FNPT connection. It features a 15.5 gpm flow rate and is constructed from brass with EPDM seals (MPN 3/4X3/4…

SKU 3G-OTH-437183

Brand
Watts
Item
Backflow Preventer: LF7R, 3/4 in Pipe Size, True Union FNPT, 15.5 gpm Flow Rate
Category
Potable Water Dual Check Backflow Preventers
Available to Order
Trade pricing by quote — replies within 24h
Qty
WhatsApp an engineer
No account needed — your quote request goes straight to our engineers. A free account lets you track quotes and re-order faster.
Worldwide Shipping
Air & sea freight
Datasheet on Request
Technical specs
1-Day Quote
Replies within 24h

Technical Specifications

Watts
Manufacturer Part Number
3/4X3/4 LF7RU2-U2
Type
True Union FNPT, Brass, EPDM
Pipe Size
3/4 in
Flow Rate
15.5 gpm
Connection Type
True Union FNPT
View Full Spec Sheet

Technical Documents

No technical documents available for this product.
Request documentation →
Not sure this is the right part? Get a recommendation.

Need installation or engineering help?

Installation, commissioning, maintenance plans, system design, and bundled product + service quotes — one team handles the full scope.
Talk to an engineer

Ask a question

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

Product Description

The WATTS LF7R is a potable water dual check backflow preventer with a 3/4 in pipe size and True Union FNPT connection. It features a 15.5 gpm flow rate and is constructed from brass with EPDM seals (MPN 3/4X3/4 LF7RU2-U2).

Frequently Asked Questions

What is the WATTS LF7R backflow preventer used for?

The WATTS LF7R is a dual check backflow preventer designed for potable water systems. It prevents contaminated water from flowing backward into clean water lines, commonly used in residential and commercial plumbing applications to protect drinking water quality.

What are the specifications of the WATTS LF7R backflow preventer?

The WATTS LF7R has a 3/4 in pipe size with True Union FNPT connections, a 15.5 gpm flow rate, and is made of brass with EPDM seals. The manufacturer part number is 3/4X3/4 LF7RU2-U2. It is a potable water dual check backflow preventer.

Where to buy the WATTS LF7R backflow preventer worldwide?

3G Electric supplies the WATTS LF7R backflow preventer worldwide. As a global industrial equipment distributor since 1990, we handle full logistics, customs clearance, and delivery to your location. Contact us for availability and lead time.

How to install the WATTS LF7R backflow preventer?

Install the WATTS LF7R in a horizontal or vertical position with flow direction matching the arrow on the body. Use thread sealant on the True Union FNPT connections and ensure the unit is accessible for testing. Follow local plumbing codes and the manufacturer's instructions for proper installation.

Used in

Common applications for Watts
Industrial burner gas safety systems — Watts HF2000 filters with GF-series seal kits maintain clean, regulated gas supply to burner pilot and main flame controls
Commercial heating and boiler installations — Modular filter assemblies support preventive maintenance and component replacement without full system shutdown
Process gas delivery pipelines — DN25 through DN125 filter bodies accommodate varying flow rates and inlet pressures across manufacturing and chemical processes
Gas pressure regulation benches — Multi-stage Watts filter platforms integrate with pressure reducers and safety shutoff valves in test and calibration environments
Equipment retrofit and upgrade projects — Available connection sizes and seal kits enable adaptation of newer Watts components into legacy gas control systems
Planned maintenance and spare-parts inventory — Filter seal kits allow facilities to stock consumables in advance, reducing downtime during scheduled gas system servicing

Watts Products

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

You might also need

Burners & Combustion →Pumps & Compressors →Spare Parts →All Products →

Similar products

Matched by specification & description
WATTS Backflow Preventer: LF7R, 1/2 in Pipe Size, True Union FNPT, 10 gpm Flow Rate, Brass, Plastic (MPN 1/2X1/2 LF7RU2-U2). Key specifications — Brand: WATTS; Connection Type: True Union FNPT.
Watts
WATTS Backflow Preventer: LF7R, 1/2 in Pipe Size, True Union FNPT, 10 gpm Flow Rate, Brass, Plastic (MPN 1/2X1/2 LF7RU2-U2). Key specifications — Brand: WATTS; Connection Type: True Union FNPT.
WATTS Backflow Preventer: LF7R, 1 in Pipe Size, FNPT x MNPT, 26 gpm Flow Rate, 1 in Overall Lg, EPDM (MPN 1X3/4 LF7RU4-3). Key specifications — Brand: WATTS; Connection Type: FNPT x MNPT.
Watts
WATTS Backflow Preventer: LF7R, 1 in Pipe Size, FNPT x MNPT, 26 gpm Flow Rate, 1 in Overall Lg, EPDM (MPN 1X3/4 LF7RU4-3). Key specifications — Brand: WATTS; Connection Type: FNPT x MNPT.
WATTS Backflow Preventer: LF7, 3/8 in Pipe Size, FNPT x FNPT, 10 gpm Flow Rate, 2.88 in Overall Lg (MPN 3/8 LF7C). Key specifications — Brand: WATTS; Connection Type: FNPT x FNPT.
Watts
WATTS Backflow Preventer: LF7, 3/8 in Pipe Size, FNPT x FNPT, 10 gpm Flow Rate, 2.88 in Overall Lg (MPN 3/8 LF7C). Key specifications — Brand: WATTS; Connection Type: FNPT x FNPT.
WATTS Backflow Preventer: LFN9, 1/2 in Pipe Size, FNPT x FNPT, 7 gpm Flow Rate, 2.38 in Overall Lg (MPN 1/2 LFN9-C). Key specifications — Brand: WATTS; Connection Type: FNPT x FNPT.
Watts
WATTS Backflow Preventer: LFN9, 1/2 in Pipe Size, FNPT x FNPT, 7 gpm Flow Rate, 2.38 in Overall Lg (MPN 1/2 LFN9-C). Key specifications — Brand: WATTS; Connection Type: FNPT x FNPT.
WATTS Dual Check Valve: LF7, 3/8 in Pipe Size, FNPT x FNPT, 10 gpm Flow Rate, 2.88 in Overall Lg (MPN 3/8 LF7). Key specifications — Brand: WATTS; Connection Type: FNPT x FNPT.
Watts
WATTS Dual Check Valve: LF7, 3/8 in Pipe Size, FNPT x FNPT, 10 gpm Flow Rate, 2.88 in Overall Lg (MPN 3/8 LF7). Key specifications — Brand: WATTS; Connection Type: FNPT x FNPT.
WATTS Backflow Preventer: 9D, 1/2 in Pipe Size, Sweat x Socket, 18.7 gpm Flow Rate, Brass, Rubber (MPN 1/2 9DS-M3). Key specifications — Brand: WATTS; Connection Type: Sweat x Socket.
Watts
WATTS Backflow Preventer: 9D, 1/2 in Pipe Size, Sweat x Socket, 18.7 gpm Flow Rate, Brass, Rubber (MPN 1/2 9DS-M3). Key specifications — Brand: WATTS; Connection Type: Sweat x Socket.

More from Watts

View all Watts parts →
WATTS Dual Check Vacuum Breaker: LFN9-CD, 3/4 in Pipe Size, FGHT x MGHT, 5 gpm Flow Rate, Brass, GHT (MPN LFN9CD). Key specifications — Brand: WATTS; Connection Type: FGHT x MGHT.
Watts
WATTS Dual Check Vacuum Breaker: LFN9-CD, 3/4 in Pipe Size, FGHT x MGHT, 5 gpm Flow Rate, Brass, GHT (MPN LFN9CD). Key specifications — Brand: WATTS; Connection Type: FGHT x MGHT.
WATTS Backflow Preventer: LF7R, 1 in Pipe Size, Female Meter Swivel x Union FNPT, 26 gpm Flow Rate (MPN 1X3/4 LF7R10-U2). Key specifications — Brand: WATTS; Connection Type: Female Meter Swivel x Union FNPT.
Watts
WATTS Backflow Preventer: LF7R, 1 in Pipe Size, Female Meter Swivel x Union FNPT, 26 gpm Flow Rate (MPN 1X3/4 LF7R10-U2). Key specifications — Brand: WATTS; Connection Type: Female Meter Swivel x Union FNPT.
WATTS Backflow Preventer: LF7, 1 1/4 in Pipe Size, Male Meter Swivel x FNPT, 33 gpm Flow Rate, Male (MPN 1-1/4X1 LF7 10-U2). Key specifications — Brand: WATTS; Connection Type: Male Meter Swivel x FNPT.
Watts
WATTS Backflow Preventer: LF7, 1 1/4 in Pipe Size, Male Meter Swivel x FNPT, 33 gpm Flow Rate, Male (MPN 1-1/4X1 LF7 10-U2). Key specifications — Brand: WATTS; Connection Type: Male Meter Swivel x FNPT.
WATTS Dual Check Vacuum Breaker: LFN9, 3/8 in Pipe Size, FNPT x FNPT, 7 gpm Flow Rate, Brass, Female (MPN 3/8 LF N9C - 3/8"). Key specifications — Brand: WATTS; Connection Type: FNPT x FNPT.
Watts
WATTS Dual Check Vacuum Breaker: LFN9, 3/8 in Pipe Size, FNPT x FNPT, 7 gpm Flow Rate, Brass, Female (MPN 3/8 LF N9C - 3/8"). Key specifications — Brand: WATTS; Connection Type: FNPT x FNPT.
WATTS Backflow Preventer: LF7R, 1 in Pipe Size, Female Meter Swivel x Union MNPT, 26 gpm Flow Rate (MPN 1X3/4 LF7R10-U3). Key specifications — Brand: WATTS; Connection Type: Female Meter Swivel x Union MNPT.
Watts
WATTS Backflow Preventer: LF7R, 1 in Pipe Size, Female Meter Swivel x Union MNPT, 26 gpm Flow Rate (MPN 1X3/4 LF7R10-U3). Key specifications — Brand: WATTS; Connection Type: Female Meter Swivel x Union MNPT.
WATTS Dual Check Valve: LF7, 3/4 in Pipe Size, FNPT x FNPT, 3.63 in Overall Lg, Copper Silicon Alloy (MPN 3/4 LF7 U2-2). Key specifications — Brand: WATTS; Connection Type: FNPT x FNPT.
Watts
WATTS Dual Check Valve: LF7, 3/4 in Pipe Size, FNPT x FNPT, 3.63 in Overall Lg, Copper Silicon Alloy (MPN 3/4 LF7 U2-2). Key specifications — Brand: WATTS; Connection Type: FNPT x FNPT.
WATTS Dual Check Valve: LF7R, 1/2 in Pipe Size, FNPT x FNPT, 15.5 gpm Flow Rate, 3.63 in Overall Lg (MPN LF7RU2-2). Key specifications — Brand: WATTS; Connection Type: FNPT x FNPT.
Watts
WATTS Dual Check Valve: LF7R, 1/2 in Pipe Size, FNPT x FNPT, 15.5 gpm Flow Rate, 3.63 in Overall Lg (MPN LF7RU2-2). Key specifications — Brand: WATTS; Connection Type: FNPT x FNPT.
WATTS Backflow Preventer: LF7R, 1 in Pipe Size, Female Meter Swivel x Union FNPT, 26 gpm Flow Rate (MPN 1X1 LF7R10-U2). Key specifications — Brand: WATTS; Connection Type: Female Meter Swivel x Union FNPT.
Watts
WATTS Backflow Preventer: LF7R, 1 in Pipe Size, Female Meter Swivel x Union FNPT, 26 gpm Flow Rate (MPN 1X1 LF7R10-U2). Key specifications — Brand: WATTS; Connection Type: Female Meter Swivel x Union FNPT.