BRAND NEW KELCH THREADED MARINE STYLE 13 1/2″ LONG VENTED GAS CAP THIS BRAND NEW KELCH GAS CAP IS A 2 1/4″ DIAMETER THREADED GAS CAP THIS IS KELCH’S NEWEST STYLE MARINE GAS CAP THE GAS CAP HAS THE ADJUSTABLE SCREW VENT IN THE CENTER OF THE GAUGE FACE PLEASE NOTE: THESE GAS CAPS ARE MADE FOR THE HIGH PROFILE PLASTIC TANKS IF YOUR TANK IS SMALLER, OR LARGER, PLEASE LET US KNOW THE TANK DEPTH THAT WAY WE CAN SEND THE APPROPRIATE LENGTH GAS CAP FOR YOU IT IS VERY IMPORTANT THAT YOU MEASURE YOUR TANK DEPTH! MAKE SURE YOUR TANK IS AT LEAST 14 ” DEEP FOR THIS GAS CAP DOES NOT FIT THE NEW EPA MOELLER TANKS, ONLY THE OLD STYLE THESE GAS CAPS FIT THE PLASTIC FUEL TANKS MADE BY MOELLER, CHILTON, YAMAHA, ATTWOOD, AND OTHERS IF YOUR TANK IS A DIFFERENT DEPTH, JUST LET US KNOW, WE HAVE SEVERAL LENGTHS AVAILABLE WE HAVE THE MARINE GAS CAPS IN LENGTHS OF 6″, 7 1/2″, 8″, 9 1/4″, 10 1/2″, 11 1/2″, 12″, 13 1/2″, AND 15″ WHEN MEASURING YOUR FUEL TANK, MEASURE FROM THE TOP OF THE FILLER NECK, STRAIGHT TO THE TANK BOTTOM