1005464 MFG #: 0121428WATTS

This 1 inch lead free automatic reseating temperature and pressure relief valve with a 7 inch thermostat is installed directly in tank tappings and is used in commercial applications to provide automatic temperature and pressure protection for hot water supply tanks and hot water heaters. It features lead free brass construction with NPT male inlet and NPT female outlet connections, thermo-bonded coated thermostat, tamper resistant bonnet screws, automatic reseating feature, and test lever. The temperature relief is 210 degrees F (99 degrees C) and the pressure relief is 150 psi.


  • Non-mechanical seat to disc alignment
  • Tamper resistant bonnet screws
  • Unique thermostat with a special thermo-bonded coating
  • Lead free brass body construction
  • Specification

Body Material   Lead Free Bronze

Brand Name      Watts

GDS Status          Registered

Inlet Connection Size     1 IN

Inlet Connection Type   Male Threaded

Inlet Thread Type            NPT

Lead Free            YES

Maximum Temperature-Fahrenheit       210

Maximum Working Pressure-PSI              113

Outlet Connection Size 1 IN

Outlet Connection Type                Female Threaded

Outlet Thread Type         NPT

Part Number     0121428

Pressure Range 75 to 150 PSI

Pressure Relief Setting-PSI          150

Pressure Steam Discharge Capacity         2,134,000 BTU per hour

Protection Type                Temperature And Pressure

Series   LF40L

Temperature Relief-Fahrenheit 210

Temperature Steam Discharge Capacity 500,000 BTU per hour

Thermostat Material      Copper

Thermostat Probe Length            7 IN