The Maid-O'-Mist #C (A888) is a 1/8 inch IPS angled steam radiator vent valve for use in a one-pipe steam heating application. It features a durable chrome-plated brass body and a single fixed vent to improve heating efficiency by releasing trapped air. The valve is designed for use on radiators farthest from the boiler or in the coldest rooms, with a venting capacity equal to 15 ordinary air valves. It has a maximum operating pressure of 5 PSI and maximum pressure of 10 PSI

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