Perko Garboard Drain Plug This garboard drain plug from Perko is a bronze flange with a brass plug. It mounts on the outside surface with 3 screws. Specifications For pipe size 12 NPT O.D. Flange 2 Screw size 8 California Residents WARNING Cancer and Reproductive Harm - P65Warnings.ca.gov Other Details Google Product Type Hardware Product MPN 0714DP1PLB Product UPC 085226036514 Fast Ship In Stock Ships Today