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40L

Automatic Reseating Temperature and Pressure Relief Valves

  • Bonnet screws are tamper-resistant
  • Automatic reseating feature
  • Accurate thermostat with special thermo-bonded coating
  • Valve provides automatic temperature and pressure protection to hot water storage tanks and water heaters

Select a Model

Select options below to identify the UPC, Order Code, and Repair Kit for a specific 40L

Approval/Certification Information

For product-specific approval information, please refer to the product’s specification sheet or ask a Watts representative. For general information regarding any approval certification partners identified in the specification sheet, please visit our certification partners’ websites:


ASSE CSA FM Approvals NSF
UL ULC USC WQA