Deck Fill Replacement Cap & ChainThis Attwood Replacement Cap and Chain is made for Attwood deck fills. The flush cap is slotted for a separate key and features an O-ring that seals the cap watertight.Features:Cap is attached by a stainless steel beaded chainSpecifications (Cap and Chain are Fitted for This Deck Fill Size):3-1/4 (inch) Fill Neck Length1-7/8 (inch) installation hole size3-inch flange sizeFits 1-1/2 (inch) I.D. Hose*Key sold separately Quick Guide (pdf)