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 Vacuum Breaker: 3/4 LF800M4-FR, FNPT x FNPT, For Water Media, 33°F – 140°F - Lead-Free Pressure Vacuum Breakers
WattsLead-Free Pressure Vacuum Breakers

Watts Vacuum Breaker: 3/4 LF800M4-FR, FNPT x FNPT, For Water Media, 33°F – 140°F

The WATTS 3/4 LF800M4-FR is a lead-free pressure vacuum breaker designed for water media in high health hazard applications. It features FNPT x FNPT connections and operates within a temperature range of 33°F to 140°F.

SKU 3G-OTH-446149

Brand
Watts
Item
Vacuum Breaker: 3/4 LF800M4-FR, FNPT x FNPT, For Water Media, 33°F – 140°F
Category
Lead-Free Pressure Vacuum Breakers
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
3/4 LF800M4-FR
Type
FNPT x FNPT, For Water Media, 33°F – 140°F, High Health Hazard
Connection Type
FNPT x 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 3/4 LF800M4-FR is a lead-free pressure vacuum breaker designed for water media in high health hazard applications. It features FNPT x FNPT connections and operates within a temperature range of 33°F to 140°F.

Frequently Asked Questions

What is a WATTS 3/4 LF800M4-FR vacuum breaker used for?

The WATTS 3/4 LF800M4-FR is a lead-free pressure vacuum breaker used to prevent backflow of contaminated water in high health hazard applications. It is installed on water lines to protect potable water supplies from cross-connections, commonly in commercial and industrial plumbing systems.

What are the specifications of the WATTS LF800M4-FR?

The WATTS LF800M4-FR has FNPT x FNPT connections, is rated for water media, and operates from 33°F to 140°F. It is designed for high health hazard applications and is lead-free. The manufacturer part number is 3/4 LF800M4-FR.

Where to buy a WATTS LF800M4-FR vacuum breaker worldwide?

3G Electric supplies the WATTS LF800M4-FR vacuum breaker to customers worldwide. We handle full logistics, customs clearance, and delivery to your site. Contact us for a quote and lead time on this lead-free pressure vacuum breaker for high health hazard applications.

How to install a WATTS pressure vacuum breaker?

Install the WATTS pressure vacuum breaker vertically with the inlet and outlet connected via FNPT fittings. Ensure it is at least 12 inches above the highest downstream outlet. Follow local plumbing codes and the manufacturer's instructions for proper backflow prevention in high health hazard systems.

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 lead-free pressure vacuum breakers. 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
HAYWARD Pressure Reducing Control Valve: CPVC, PTFE, 3/8 in x 3/8 in, NPT x NPT, 34°F to 250 psi (MPN RPV2037TPE1). Key specifications — Brand: HAYWARD.
HAYWARD
HAYWARD Pressure Reducing Control Valve: CPVC, PTFE, 3/8 in x 3/8 in, NPT x NPT, 34°F to 250 psi (MPN RPV2037TPE1). Key specifications — Brand: HAYWARD.
HAYWARD Pressure Reducing Control Valve: PTFE, 3/4 in x 3/4 in, NPT x NPT, 34°F to 250 psi, 34°F (MPN RPV5075TPE1). Key specifications — Brand: HAYWARD.
HAYWARD
HAYWARD Pressure Reducing Control Valve: PTFE, 3/4 in x 3/4 in, NPT x NPT, 34°F to 250 psi, 34°F (MPN RPV5075TPE1). Key specifications — Brand: HAYWARD.
HAYWARD Pressure Reducing Control Valve: CPVC, PTFE, 2 in x 2 in, NPT x NPT, 34°F to 250 psi, 34°F (MPN RPV2200TPE1). Key specifications — Brand: HAYWARD.
HAYWARD
HAYWARD Pressure Reducing Control Valve: CPVC, PTFE, 2 in x 2 in, NPT x NPT, 34°F to 250 psi, 34°F (MPN RPV2200TPE1). Key specifications — Brand: HAYWARD.
HAYWARD Pressure Reducing Control Valve: PTFE, 3/8 in x 3/8 in, NPT x NPT, 34°F to 250 psi, 34°F (MPN RPV5037TPE1). Key specifications — Brand: HAYWARD.
HAYWARD
HAYWARD Pressure Reducing Control Valve: PTFE, 3/8 in x 3/8 in, NPT x NPT, 34°F to 250 psi, 34°F (MPN RPV5037TPE1). Key specifications — Brand: HAYWARD.
HAYWARD Pressure Reducing Control Valve: PTFE, 1/4 in x 1/4 in, NPT x NPT, 34°F to 250 psi, 34°F (MPN RPV5025TPE1). Key specifications — Brand: HAYWARD.
HAYWARD
HAYWARD Pressure Reducing Control Valve: PTFE, 1/4 in x 1/4 in, NPT x NPT, 34°F to 250 psi, 34°F (MPN RPV5025TPE1). Key specifications — Brand: HAYWARD.
HAYWARD Pressure Reducing Control Valve: CPVC, PTFE, 1/2 in x 1/2 in, NPT x NPT, 34°F to 250 psi (MPN RPV2050TPE1). Key specifications — Brand: HAYWARD.
HAYWARD
HAYWARD Pressure Reducing Control Valve: CPVC, PTFE, 1/2 in x 1/2 in, NPT x NPT, 34°F to 250 psi (MPN RPV2050TPE1). Key specifications — Brand: HAYWARD.

More from Watts

View all Watts parts →
WATTS Anti-Siphon Backflow Preventer: 3/4 LF800M4-QT-FZ, FNPT x FNPT, For Water Media, 33°F – 140°F. Key specifications — Brand: WATTS; Connection Type: FNPT x FNPT.
Watts
WATTS Anti-Siphon Backflow Preventer: 3/4 LF800M4-QT-FZ, FNPT x FNPT, For Water Media, 33°F – 140°F. Key specifications — Brand: WATTS; Connection Type: FNPT x FNPT.
WATTS Anti-Siphon Backflow Preventer: 1 LF 008PCQT-1", FNPT x FNPT, For Water Media, 33°F – 180°F. Key specifications — Brand: WATTS; Connection Type: FNPT x FNPT.
Watts
WATTS Anti-Siphon Backflow Preventer: 1 LF 008PCQT-1", FNPT x FNPT, For Water Media, 33°F – 180°F. Key specifications — Brand: WATTS; Connection Type: FNPT x FNPT.
WATTS Vacuum Breaker: 1/2 LF800M4-FR, FIP x FIP, For Water Media, 33°F – 140°F, High Health Hazard. Key specifications — Brand: WATTS; Connection Type: FIP x FIP.
Watts
WATTS Vacuum Breaker: 1/2 LF800M4-FR, FIP x FIP, For Water Media, 33°F – 140°F, High Health Hazard. Key specifications — Brand: WATTS; Connection Type: FIP x FIP.
WATTS Vacuum Breaker: 1/2 LF800M4-QT, FNPT x FNPT, For Water Media, 33°F – 140°F, High Health Hazard. Key specifications — Brand: WATTS; Connection Type: FNPT x FNPT.
Watts
WATTS Vacuum Breaker: 1/2 LF800M4-QT, FNPT x FNPT, For Water Media, 33°F – 140°F, High Health Hazard. Key specifications — Brand: WATTS; Connection Type: FNPT x FNPT.
WATTS Vacuum Breaker: 2 LF800M4-FR, FNPT x FNPT, For Water Media, 33°F – 140°F, High Health Hazard. Key specifications — Brand: WATTS; Connection Type: FNPT x FNPT.
Watts
WATTS Vacuum Breaker: 2 LF800M4-FR, FNPT x FNPT, For Water Media, 33°F – 140°F, High Health Hazard. Key specifications — Brand: WATTS; Connection Type: FNPT x FNPT.
WATTS Vacuum Breaker: 1 1/2 LF800M4-QT, FNPT x FNPT, For Water Media, 33°F – 140°F, Back-Siphonage (MPN 1-1/2 LF800M4-QT). Key specifications — Brand: WATTS; Connection Type: FNPT x FNPT.
Watts
WATTS Vacuum Breaker: 1 1/2 LF800M4-QT, FNPT x FNPT, For Water Media, 33°F – 140°F, Back-Siphonage (MPN 1-1/2 LF800M4-QT). Key specifications — Brand: WATTS; Connection Type: FNPT x FNPT.
WATTS Vacuum Breaker: 1 1/4 LF800M4-QT, FIP x FIP, For Water Media, 33°F – 140°F, High Health Hazard (MPN 1-1/4 LF800M4-QT). Key specifications — Brand: WATTS; Connection Type: FIP x FIP.
Watts
WATTS Vacuum Breaker: 1 1/4 LF800M4-QT, FIP x FIP, For Water Media, 33°F – 140°F, High Health Hazard (MPN 1-1/4 LF800M4-QT). Key specifications — Brand: WATTS; Connection Type: FIP x FIP.
WATTS Anti-Siphon Pressure Vacuum Breaker: 1 LF800M4-QT-FZ, FNPT x FNPT, For Water Media, Bronze. Key specifications — Brand: WATTS; Connection Type: FNPT x FNPT.
Watts
WATTS Anti-Siphon Pressure Vacuum Breaker: 1 LF800M4-QT-FZ, FNPT x FNPT, For Water Media, Bronze. Key specifications — Brand: WATTS; Connection Type: FNPT x FNPT.