Container No. 1 is only compatible with standard 1" diameter vents shown below. Note that Container No. 2 and Container No. 3 both fit the same vent styles, but the two containers have a 16 oz. capacity difference. We recommend Container No. 3 for larger yachts (30' and up) and Container No. 2 for smaller boats with minimal storage. Our largest option, Container No. 4, is compatible with Hatteras Yachts and other yachts with a vent larger than 2" in diameter. This container was designed for marinas and fuel docks.