PERKO DIESEL DECK PLATE FOR HOSE #1270DPDCHR. Chrome Plated Zinc Alloy. Black Plastic Cap. Deck Plate Key, O-Ring and Integral Retainer on Cap Included. Cap has a slot between the holes. Ground Wire Required . For Hose Size: 1-1/2". O.D. Flange: 3-1/4". Length of Neck : 2-1/2 ". Mounting Hole Dia.: 2-1/8 ". Screw Size: #8. SPARE PARTS: Gas Cap with O-Ring and Retainer : 1270DPG99A. Diesel Cap with O-Ring and Retainer : 1270DPD99A. Water Cap with O-Ring and Retainer : 1270DPW99A. O-Rings (2 per bag) : 0513DP8. Deck Plate Key : 12487-8DP.