The drain valve holds back all the water in the tank so for obvious reasons you must drain the tank completely before removing the old valve.
Hot water tank drain valve.
It s always a good idea to confirm the source of the water before assuming it s the drain valve though.
Open drain valve open the drain valve and allow the water to drain from the tank.
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Hook the hose up to the drain valve and put the other end in a drain.
Make sure the hose is going to stay in the drain.
Make sure the water is not coming from these other areas before you continue.
Again the water will be hot so use caution.
Once all water has drained from the tank briefly turn on the cold water supply to the tank.
Use a screwdriver to open the water heater drain valve.
Usually ships within 1 to 2 months.
Water heater drain valves are used to drain the hot water from the tanks which is a common maintenance task done to remove built up sediment.
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Follow all of the necessary steps for shutting down your water heater before draining the tank.