2-1/4" O.D. Threaded Bungs From Tanks Inc. #TK 4B MILD STEEL 2" LONG / EACH Quantity:   Only  $12.00    #TK 5B MILD STEEL 3" LONG / EACH Quantity:   Only  $15.00    #TK 4BS STAINLESS 2" LONG / EACH Quantity:   Only  $20.00    #TK 3BS STAINLESS 3" LONG / EACH Quantity:   Only  $30.00