PrintWater Well Caps Well caps keep contaminants out of the water supply. We offer well caps in a variety of sizes and materials to fit your application. Specs/Part #s Approx. Wt. Lbs. Casing Size Part Number O.D. I.D. WATER TIGHT CONDUIT CAPS WITH VENT 2 - 12 4 1/2" 4" SAWTCC4 3 - 0 5 9/16" 5" SAWTCC5 3 - 4 6" 5 5/8" SAWTCC56 3 - 8 6 5/8" 6" SAWTCC6 3 - 12 7" 6 5/8" SAWTCC66 4 - 0 8 5/8" 8" SAWTCC8 WATER TIGHT CAPS WITHOUT VENTS 1 - 4 4 1/2" 4" SAW4 1 - 9 5 9/16 5" SAW5