UPC: 850006478026; ASIN: B07QGYBLBD The opening of the cap is approximately 11/16". Therefore, check your cans rear vent size before you make a purchase. Made of very high-quality plastic. Includes Rubber Gasket for a tight fit and avoid leaks. Pack of 2 at a very affordable price. Buy with confidence Brand New, Never Used 2 units Rear Vent Screw Caps. PLEASE DOUBLE CHECK YOUR CAN MEASUREMENTS. This opening is approximately 11/16". AFTERMARKET REPLACEMENT PART FOR plastic gas, diesel, kerosene, water cans vintage style cans with rear vent ports. Not all gas can part are interchangeable between brands, these caps do not fit any very brand. Therefore, Please double check your requirements and ask any questions prior to purchase to ensure getting the right parts the 1st time.