Seat located above drain water can't be trapped and sediment can't foul seat Non-mechanical seat-to-disc alignment will not stick or freeze Water seal of high temperature resisting material isolates spring working parts from water during relief Nonmetallic disc-to-metal seating The discharge line must be the same size as the valve outlet, and must pitch downward from the valve to a safe place for disposal Valve lever must be tripped at least once a year to ensure that waterways are clear, This device is designed for emergency safety relief and shall not be used as an operating control

ASME Section IV|MIL-V-18634B | PROP65: This product can expose you to chemicals including lead which is known to the State of California to cause cancer and birth defects or other reproductive harm.