- Prevents back-siphoning to protect CO2 system from water damage and flooding during power outage
- Brass is a highly corrosion resistant material in high humidity environment and has lasting durability and less leakage
- Air tube tightening nut ensures secure air tube connection and continuous air-flow
- Arrow marking showing the direction of flow – away from your regulator
- Compatible with AQUATEK CO2-Proof tubing
!!do not remove!!