Use channel locks or pliers to grip the silver cap and turn it counter-clockwise until it is loose.

We highly recommend using something soft, like an old inner tube shown in the picture, to protect the aluminum body from chipping or scratching. Be sure that the material you use won't slide on the polished aluminum.

Continue turning the silver cap counter-clockwise by hand until it fully unthreads.

Pull the pump plunger out of the pump body.