This optional water valve (used in place of a pump) is designed to be installed in a pressurized water line and to be controlled by your CO2 monitor. This is a high quality solid brass valve designed for years of service. The valve has 1/2 NPT outlets that can be used to attach the valve inline with your existing plumbing or you can install on '' hose barbs to make the connection. You will need either a pump or a valve but not both. 1 Year Warranty.