Watts Vacuum Breaker
Model LFN36-M1
Sizes: 1⁄2" mpt

Lead Free* Water Service Vacuum Relief Valves

Series LFN36 Lead Free* Water Service Vacuum Relief Valves are used in water heater/tank applications to automatically allow air to enter into the piping system to prevent vacuum conditions that could siphon the water from the system and damage water heater/tank equipment. It consists of a Lead Free* brass body construction with NPT male inlet connection, and a protective cap. Series LFN36 has a low profile design, is tested and rated to ANSI Z21.22, and is CSA certified. It is suitable for low pressure steam and water service, and is ideal for use in domestic water heaters and supply tanks, table top heaters, jacketed steam kettles, unit heaters, low pressure steam systems, and steam coil heaters. Maximum Working Pressure: 200psi (13.8 bar), Maximum Steam Pressure: 15psi (103 kPa).


Product Function:
The Watts LFN36-M1 Vacuum Relief Valve permits air to enter and prevent vacuum conditions that could siphon the water from the system, resulting in collapse of a tank or water heater or equipment burn out.


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Product Application:
• Domestic water heaters and supply tanks
• Solar water heater systems
• Table top heaters
• Solar pool heating systems

Note: Vacuum relief valves are not designed or approved as
back-siphonage backflow preventers. For protection against
back-siphonage install Watts Series 288A vacuum breakers.

 LFN36-M1 Installation Instructions

 LFN36-M1 Data Sheet

Product Limited Warranty:

*The wetted surface of our Lead Free products contacted by consumable water contain less than one quarter of one percent (0.25%) of lead by weight.

Processing and Delivery Information: Please allow Processing Time as stated above for your order, plus standard transportation delivery time. Orders placed after 2PM EST may not begin processing until the next business day. Please call for Rush Processing and/or Rush Shipping options.