Sea-Dog Flush Mount Combo Drink Holder w/Drain Fitting - Stamped 304 Stainless SteelFlush Mount Combo Drink Holder with Drain Fitting Stamped 304 Stainless Steel Flush Mount Combo Drink Holders with Drain Fittings feature a dual purpose design that allows the use of beverage cans with or without insulated can wraps, as well as most standard size bottles. Integral drain fitting allows water to be drained directly into the bilge with the use of 1 4" tubing (not included). Requires a 3 5 8" diameter hole for installation. The bottom is