Watts F121459 Valve

The Watts F121459 LF140X-8 is a 3/4-inch lead-free temperature and pressure relief valve designed for water heaters, storage tanks, and commercial hot water systems requiring dependable overpressure and overtemperature protection. Rated for 150 PSI and 210°F, this automatic reseating valve helps protect plumbing and heating equipment from unsafe operating conditions caused by thermal expansion and excessive system pressure.

This model features an 8-inch coated thermostat probe for accurate temperature sensing and includes a discharge line flood sensor for additional leak detection and safety monitoring. In field applications, technicians commonly install the LF140X-8 on commercial water heaters, storage tanks, and hydronic systems where code-compliant thermal and pressure protection is required.

Proper relief valve operation is essential for protecting piping, tanks, and connected equipment from pressure buildup and excessive thermal stress.

Key benefits:

• 150 PSI and 210°F temperature and pressure protection
• Lead-free construction for potable water applications
• Automatic reseating design for dependable operation
• 8-inch coated thermostat probe for accurate sensing
• Includes discharge line flood sensor for added safety monitoring

Common questions:
What does this valve do? It relieves excess pressure and temperature in hot water systems.
What is the flood sensor used for? It helps detect discharge line leaks or valve discharge events.
Where is this valve commonly installed? On water heaters, storage tanks, and commercial hot water systems.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.

F121459 is the cross for 0121459