Jacobus / Maid-O-Mist #4 Radiator Vent Air Valves. These are brand new, genuine, straight from the factory valves, not closeouts or returns. Your satisfaction is guaranteed or your money back!! Please see application chart picture for proper room placement or e-mail me for help. If you are interested in other sizes or styles of Maid O Mist or other brands of radiator air valves, please view my other auctions or feel free to e-mail me.