Ao Smith 00421509000728 Genuine Original Equipment Manufacturer (OEM) Part for Ao Smith by AO Smith at Defy Now. MPN: 00421509000728. Hurry! Limited time offer. Offer valid only while supplies last. Genuine Original Equipment Manufacturer (OEM) parts! This temperature and pressure relief valve (part number 9000728) is for water heaters. Temperature and pressure relief valve 9000728 is a safety device that opens and releases pressure if the tank overheats. Disconnect electrical power to the water heater and drain the tank below the level of the temperature and pressure relief valve before installing this part. Wear work gloves to protect your hands. For Ao Smith.This part is compatible with
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