CISNO 6-ft Fuel Line Assembly Hose with Primer Bulb for Marine Boat RV Van Tractor (5/16"- inside diameter, ordinary tubing) Suitable for Carburettor and low pressure fuel systems 8mm fuel primer pump petrol, Material: Light wieght Alloy and Rubber Frequently used as a hand pump in boats for fuel supply to the out-board engine. RVs, Tractors, and Caravans. Universal Fuel Line - 3/8" 10mmHose with 6ft long line. Premium quality rubber bulb with rubber line hose, Stainless steel clamps. Compatible with ethanol blended fuels, Engineered low permeation material prevents fuel evaporation, Suitable for Boats, RVs, Tractors, and Caravans.