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The 925006-00 from Varivalve is an adjustable Straight Radiator Air Vent with a 1/8" pipe thread, designed for a single pipe steam heating/venting. It drives out the air before the steam enter the radiator. Gain control over the radiator steam fill time speed by simply installing a radiator air vent with a certain venting capacity. This air valve offers quiet operation and is ideal for balancing out the heat distribution in a building.