This is a high-quality OEM sourced replacement part which is specially designed for use with Kawasaki handheld lawn and garden equipment. By pressing on the pump-priming bulb, it will force fuel into the line from the tank into the carburetor. Once the carburetor is full of fuel, the excess will be purged back into the tank, over time the...Read more primer will lose its elasticity or crack eventually requiring a replacement. Please note this part is made of durable rubber material and is sold individually.