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Watts LFN36-M1-3/4" Brass Vacuum Release Valve, 3/4 in Inlet - Vacuum Release Valves
WattsVacuum Release Valves

Watts LFN36-M1-3/4" Brass Vacuum Release Valve, 3/4 in Inlet

The WATTS Vacuum Relief Valve (MPN LFN36-M1-3/4") is a brass vacuum release valve for domestic water heaters and supply tanks, with a 3/4 in inlet connection size. 3G Electric interprets this demand and sources the…

SKU 3G-OTH-431018

Also listed as: LFN36M134 · LFN36 M1 3 4 · LFN36-M1-3-4

Brand
Watts
Item
LFN36-M1-3/4" Brass Vacuum Release Valve, 3/4 in Inlet
Category
Vacuum Release Valves
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Technical Specifications

Watts
Manufacturer Part Number
LFN36-M1-3/4"
Type
Brass
Inlet Connection Size
3/4 in

Technical Documents

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

Product Description

The WATTS Vacuum Relief Valve (MPN LFN36-M1-3/4") is a brass vacuum release valve for domestic water heaters and supply tanks, with a 3/4 in inlet connection size. 3G Electric interprets this demand and sources the genuine WATTS part across 14 industrial departments — with specialist depth in pumps and controls — ensuring you get the right answer, not just a catalog.

Frequently Asked Questions

What is a Watts vacuum relief valve used for?

A Watts vacuum relief valve prevents vacuum conditions in domestic water heaters and supply tanks. It automatically admits air when internal pressure drops below atmospheric, protecting tanks from collapse or implosion. Common in commercial and residential plumbing systems.

What are the specifications of the Watts LFN36-M1-3/4" vacuum relief valve?

The Watts LFN36-M1-3/4" is a brass vacuum relief valve with a 3/4 inch inlet connection size. It is designed for domestic water heaters and supply tanks. The manufacturer part number is LFN36-M1-3/4". Watts is the OEM brand.

Where to buy Watts vacuum relief valves worldwide?

3G Electric supplies Watts vacuum relief valves 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 on the LFN36-M1-3/4" model.

How to install a Watts vacuum relief valve on a water heater?

Install the Watts vacuum relief valve vertically on the cold water supply line or tank top, above the heater. Ensure the inlet connection matches your pipe size (3/4 inch for LFN36-M1-3/4"). Follow local plumbing codes and the manufacturer's instructions for proper orientation and sealing.

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 vacuum release valves. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.

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Compatible alternatives & equivalents

Cross-referenced by specification & description
This non-code temperature and pressure relief valve features a copper silicon alloy body with 1/2 in x 1/2 in FNPT connections. It is designed to automatically shut off gas supply when water temperature exceeds a safe limit, providing overheat protection in water heating systems
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This non-code temperature and pressure relief valve features a copper silicon alloy body with 1/2 in x 1/2 in FNPT connections. It is designed to automatically shut off gas supply when water temperature exceeds a safe limit, providing overheat protection in water heating systems
Non-code temperature and pressure relief valve with a copper silicon alloy body. Features 1/2 in FNPT x 1/2 in FNPT connections. Used in water heating systems to relieve excess temperature or pressure
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Non-code temperature and pressure relief valve with a copper silicon alloy body. Features 1/2 in FNPT x 1/2 in FNPT connections. Used in water heating systems to relieve excess temperature or pressure
Bronze-bodied non-code temperature and pressure relief valve with 3/4 in MNPT x 3/4 in FNPT connections. Used in gas systems to shut off flow when a preset temperature is exceeded, providing overheat protection in heating equipment and pipelines
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Bronze-bodied non-code temperature and pressure relief valve with 3/4 in MNPT x 3/4 in FNPT connections. Used in gas systems to shut off flow when a preset temperature is exceeded, providing overheat protection in heating equipment and pipelines
This non-code temperature and pressure relief valve features a bronze body with a 3/4 in MNPT x 1/2 in FNPT connection. It is designed to shut off gas flow when water temperature exceeds a safe limit, commonly used in water heating systems to prevent overheating
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This non-code temperature and pressure relief valve features a bronze body with a 3/4 in MNPT x 1/2 in FNPT connection. It is designed to shut off gas flow when water temperature exceeds a safe limit, commonly used in water heating systems to prevent overheating
Brass water pressure regulator with 1/4 in FNPT x FNPT connections. Adjustable from 50 to 175 psi. Low-lead compliant. Used to reduce and stabilize incoming water pressure in plumbing systems, protecting downstream fixtures and piping from pressure fluctuations
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Brass water pressure regulator with 1/4 in FNPT x FNPT connections. Adjustable from 50 to 175 psi. Low-lead compliant. Used to reduce and stabilize incoming water pressure in plumbing systems, protecting downstream fixtures and piping from pressure fluctuations
This Watts pressure relief valve is designed for hot water service in hydronic heating systems. It features a copper alloy body with 3/4 in MNPT x 3/4 in FNPT connections and a maximum operating pressure of 125 psi. Certified to ASME Section IV, it automatically opens at set pressure to protect boilers and water heaters from overpressure
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This Watts pressure relief valve is designed for hot water service in hydronic heating systems. It features a copper alloy body with 3/4 in MNPT x 3/4 in FNPT connections and a maximum operating pressure of 125 psi. Certified to ASME Section IV, it automatically opens at set pressure to protect boilers and water heaters from overpressure

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Brass vacuum release valve with 1/2-inch male NPT inlet. Automatically admits air to prevent vacuum conditions in water heaters and storage tanks, protecting against tank collapse or implosion
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Brass vacuum release valve with 1/2-inch male NPT inlet. Automatically admits air to prevent vacuum conditions in water heaters and storage tanks, protecting against tank collapse or implosion