Attwood's low-permeation Fuel Line Kits set the standard in performance, safety and value. They include Attwood's award-winning Universal Sprayless Connector (hose and tank fittings with thread sealant), multi-layer low-permeation Primer Bulb and low-permeation fuel line. Fuel Demand Valve is optional. Multi-Layer Primer Bulb with new High-Performance Check Valve and O-Ring: Provides 30% faster priming during start-up and 20% to 35% higher running flow than competitive designs. Ethanol Resistant Fuel Line: Eliminates inner-layer delamination seen by others. Fuel Demand Valve (if equipped): Prevents engine flooding by restricting pressurized fuel from reaching the engine. Universal Sprayless Tank Fitting: Enables a safe, gas-free experience at every connection.