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The WATTS 4020716 is a temperature and pressure relief valve designed to protect water heaters from dangerous overpressure and overtemperature conditions. Rated at 150 pounds per square foot (lb) with a 3/4 inch connection size, this valve automatically opens to release excess pressure or heat before the storage vessel reaches a failure point. It is a critical safety component installed on residential and light commercial water heating equipment. Licensed plumbers and HVAC technicians are the primary installers of this type of valve.
This relief valve is used in residential and light commercial water heater installations where a dedicated T and P valve is required by plumbing code. It fits the standard 3/4 inch threaded port found on most tank-style water heaters. The 100XL-8 designation identifies this as part of the WATTS 100XL series, which is commonly specified for potable water heating applications requiring reliable overpressure protection.
Designed as an OEM-style replacement temperature and pressure relief valve for residential and light commercial tank-style water heaters equipped with a 3/4 inch T and P port.
Installation must be performed by a licensed plumber in accordance with the International Plumbing Code (IPC) and local authority having jurisdiction requirements. Always shut off the cold water supply and disconnect power or gas to the water heater before removing an existing relief valve. The discharge port must be piped to an appropriate floor drain or relief discharge point per code. Never cap, plug, or restrict the discharge line of a T and P relief valve.
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