Fittings Only - for servicing additonal tanks with your FizzWizz Bubbles Anywhere system. Fittings Details - Stone Modification Kit The Stone Modification Kit is a custom check valve with zero-crack pressure and an isolation valve at a 90-degree angle. It prevents product backflow into the FizzWizz, discharges during accidental CO2 line disconnections, and reduces equipment collision risks. The isolation valve enables tank sealing when disconnecting the CO2 line. (This package of fittings will service one tank.) *Includes arm base fitting with isolation valve to support the connection of the FizzWizz sight glass. This allows for head pressure readings during carbonation mode and CO2 input during head transfer/packaging mode. Please ensure before order that this package has the correct fittings for your tank. (Please watch installation video.) Still have questions? Give us a call at 1-778-943-2249!