Perko Water Deck Plate #1270DPWCHR: Made of die cast zinc, chrome plated. Both the flange and cap are marked "Water". Cap is black plastic with "O" ring for water tightness, supplied with 24" monofilament cord attached to cap. For 1-1/2" hose, neck length 2". Flange diameter 3-1/4". Cap has both holes and slot, so that a key or a screw driver or coin can be used for opening and closing.