Pactrade Marine 2 Pcs Boat Black Rubber Jumbo 3/8" Primer Bulb Hose for Outboard Fuel Tanks 2 pcs black rubber jumbo primer bulb with 3/8" hose The primer bulb and hose allow greater fuel flow in harsh marine environments. It is designed to prevent fuel evaporation, and save gasoline. Length: 7.5" Width: 1.7"