Features: * Replaces Ultra Flow bulb * Large alcohol compounded primer bulb for 3/8-inch fuel line assemblies * Reduces flow restriction for maximum flow * Spring loaded check valve provides a quicker prime * Oversize double check valves to hold prime longer * Stainless steel clamps * Marine * 3/8 inch size What"s In The Box: * United States Hardware M-011C 3/8-Inch Fuel Primer Bulb Marine