Watts LFN36M1-3/4 Vacuum Relief Valve

Watts LFN36M1-3/4 Vacuum Relief Valve delivers dependable vacuum relief for low-pressure steam and water systems. Built with a durable brass body and a 3/4 inch male threaded inlet, it supports domestic water heaters, table-top heaters, unit heaters, and jacketed steam kettles.

Rated to 250°F and 200 PSI SWP, this valve uses a Buna-N seal, a silicone disc, and a 302 stainless steel spring for reliable operation. The glass-filled polysulfone float ensures stable venting, while a protective cap and polypropylene cover guard against debris. It is lead-free and complies with ANSI Z21.22, CSA, and ISO 9001 standards.

• Low profile design for compact installations
• Brass body with 3/4" male threaded inlet
• Buna-N seal, silicone disc, and 302 stainless steel spring
• Glass-filled polysulfone float with 15 CFM venting capacity
• Protective cap and polypropylene cover
• Lead-free; ANSI Z21.22, CSA, ISO 9001 compliant
• Suitable for low-pressure steam and water service, including domestic water heaters and small- to mid-sized commercial systems