# 5 - 1/8" Straight Radiator Steam Vent, Jacobus - Maid-O-MistMaid O Mist, Jacobus Model # 5 Venting capacity equal to 4 ordinary air valves. Use on radiators near boiler and in warm rooms (second floor radiators, for example) Features: Self adjusting thermostatic control Float to prevent water escape Reduces radiator noise Cut fuel consumption Assures even heat distribution Lower operating costs Improved nickel plated brass body, valve seat, solid float and bi metal thermostatic element Jacobus Radiator Steam