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P-812.4 Combined Temperature and Pressure Relief
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A combination pressure and temperature relief valve of an approved type shall be accepted in lieu of separate valves, provided it meets the requirements for separate valves. The combined relief valve shall be located as a temperature relief valve and shall be installed in the hot water connection to the heater or storage tank in such a manner that the stem of the temperature-sensing element will project at least one inch into the tank.
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