SeaDog Flush Mount Combo Drink Holder w/Drain Fitting 

"Injection molded ABS. Dual purpose design allows use of beverage cans with or without insulated can wraps. Drain fitting allows water to be drained to bilge. Use 1/4" tubing for drain, secure with tie wrap if needed."

Color: White, Hole: 3-3/4", A: 4", B: 3-5/8", C: 3-1/4", D: 15/16"