PrintThreaded Butterfly Valve The threaded connectors eliminate the need for flanges on this high-quality butterfly valve. Specs/Part #s Approx. Wt. Lbs. Description Size Part Number Disk Material Rubber Material --- Aluminum Bronze Buna 2" BFVT2 12 Aluminum Bronze Buna 3" BFVT3 --- Aluminum Bronze Buna 4" BFVT5 --- Aluminum Bronze Buna 6" BFVT01263