This Oblong Captive Garboard Drain & Plug sits lower in the stern for more water removal. Captive plug prevents plug from being lost. Constructed of investment cast 316 stainless steel. Installs with two #8 FH fasteners (not included). A 2-7/16" B 1/2" C 1-1/8" D 2-5/8" E 1-13/16"