Watts LFN36M1 3/4 Lead-Free Relief Valve, Brass, MNPT

The Watts LFN36M1 3/4 is a 3/4" lead-free vacuum relief valve for storage tank vacuum service. It features a brass body. Rated to 15 psi and up to 250°F. This model is certified lead-free for potable-water installations.

This 3/4 inch lead free vacuum relief valve is suitable for low pressure steam and water service, and is ideal for use in domestic water heaters and supply tanks. This valve automatically allows air to enter into the piping system to prevent vacuum conditions that could siphon water from the system and damage water equipment. It consists of a lead free brass body construction with NPT male inlet connection, and a protective cap. Maximum working pressure is 200 psi.

Features

• Lead free construction
• Low profile
• Maximum temperature 250 degrees
• Maximum steam pressure 15 psi

Common Questions

What pressure does this relieve at?

None — this is a vacuum relief valve, not a pressure relief valve. It opens inward to admit air when the system goes into a vacuum (typically when a tank drains), which prevents the tank from collapsing. It does nothing about overpressure, and it does not replace the T&P valve a water heater requires.

Can I use this on potable water?

Yes. It is certified lead-free to NSF/ANSI 372, which is what plumbing codes require for any device in a drinking-water line.

Specifications

• Type: Relief
• Size: 3/4"
• Inlet Size: 3/4"
• Connection: MNPT
• Body Material: Brass
• Max Pressure (psi): 15
• Pack Quantity: 24
• Country of Origin: China
• Warranty: 1 Year Limited
• MPN: LFN36M1 3/4
• Temperature: up to 250°F
• Lead-Free: Yes
• Relief Type: Vacuum
• Application: Storage Tank Vacuum
• Approved for Potable Water: Yes
• SentryPlus Alert Flood Sensor: No