Sterling Infinity Auto Changover Pressure System - Type 30 for CO2 Cleaning & Packaging The integrated duotight design means

The integrated duotight design means you can connect your beer line directly

To clean your sintered stainless stone

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but when chilled it can shrink slightly

screw down the knob to engage and you can fill like you would a keg through the ball lock post

Sterling Infinity Auto Changover Pressure System - Type 30 for CO2 Cleaning & Packaging The integrated duotight design meansThe Infinity Auto Changeover senses a depleted pressure in the priotised cylinder and automatically switches to the reserve cylinder. This is particuarly beneficial for larger venues or the serious home user who doesn't want to keep switching out cylinder with downtime.