Profile: Bruce Supply Corp. deals with the distribution of plumbing, heating, waterworks and industrial supplies. Our products list includes air vents, thermostats, valves, water feeders, pipes & fittings and boilers/heaters. We offer brands such as Watts, Taco, Takagi, Modine and Amerivent. The Watts' series FV-4 automatic vent valve consists of a brass body construction with female NPT connection, brass cover, air vent with silicone rubber seal, polyethylene float with valve plug and automatic vent. The Taco 409 automatic air vent has a conical shape that increases the clearance between water level and internal mechanisms, reducing the potential that dirt floating on top of the water can foul the venting operation.