Description Pack quantities: Select low-cost items on this page are sold in multi-packs. The pack quantity is shown with each selection and the price shown is per pack. Campbell Tank Float & Air Valve Accessories by Campbell Manufacturing. Tank Float Valve (TFV): red brass — controls water level and acts as check valve against back flow Tank Float (TF12): 12" diameter with UV/corrosion-resistant polyethylene and styrofoam core Bleeder Orifice (BOB/BOR): imported, 3/4" brass or 1" rubber — used with air volume controls Snifter Valve (SV): imported unplated brass, 1/4" — with rubber gasket for air admission Select Category and Description from the dropdowns