A pack made up of a TP Valve and a Drain Cock.
Every water heater, gas or electric, should have a temperature and pressure relief valve, commonly called a T&P valve. Your water heater isn't safe without one. It's so important, in fact, that many states require factories to install T&P valves rather than leaving the decision to homeowners and installers.
A drain cock is a device for venting liquid from a pressurized vessel.
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