WATER REGULATOR, IN LINE, PRE-SET 50LBS This in line water regulator will maintain a maximum water pressure of 50lbs. This will eliminate high water pressure from flooding the carbonator tank and not allowing CO2 pressure In. No screws to adjust and no maintenance is required. It has a built in check valve to avoid water backups. It also has a molded arrow onto the plastic to let you know which direction to install the regulator. It is highly recommended to install your water regulator as close to the carbonator as possible.