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Product details

The combined 2-in-1 temperature and pressure relief valve provides the least expensive and proven means for protection against both excessive temperature and pressure emergency conditions. Fully automatic temperature and pressure relief protection for domestic hot water supply tanks and heaters based on the latest ANSI Z21.22 Listing requirements for temperature discharge capacity.

  • Non-mechanical seat-to-disc alignment
  • Thermostat is accurate and proven, exclusively designed and manufactured by Watts
  • Tamper-resistant bonnet screws
  • Feature a unique thermostat with a special thermo-bonded coating
  • 40XL with test lever and extension thermostat for installation in hot water outlet within the allowable distance from the top of the tank based on latest ANSI Z21.22
  • Documentation

    Technical Specs

    SKU: 59212NL
    Model: 40XL-5
    nominal size: 3/4 x 3/4" pressure rating: 75 - 150 psi
    material: Bronze prop65 warning: California Proposition 65 Warning, This product can expose you to chemicals including lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to
    series: 40XL Series country of origin: US
    temperature rating: 210 deg F product type: Temperature & Pressure Relief Valves
    connection type: Male x Female type: Automatic Reseating, No-Lead
    btu rating: 250000 BTUH dimensions: 2-5/8 Inch Width x 5-5/8 Inch Height

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