Seachoice Garboard Drain Plug Only 1/2" S/S 50-18721 by Seachoice $6.88 1 2 3 4 5 6 7 8 9 10+ Quantity Quantity Add to cart Seachoice Garboard Drain Plug Only 1/2" #50-18721 Pipe size is 1/2" NPT. Stainless Steel.