Your peddle is connected to the ball and the water valve. Since you are getting water and the ball won't open, the connection from the peddle to the ball has either broken or come loose. Removing the peddle assembly should show you what's wrong or which part needs replacing.
John & Clare - Buck & Zeus - Jack & Husky
2008 Fleetwood Bounder 38P
Towd: 2 HD Streetglides