The method most commonly used previously for water cooling systems is normal PVC hoses - now Alphacool offers another approach to water cooling. The Alphacool HardTube again brings more tidiness into the system which makes a much more structured impression. Brand new plexi tubes with the Alphacool HT connectors make installation very simple, they connect completely sealed together. The plexi tube can be adapt to the system with the appropriate bending tool without needing to use additional angles. For use with Alphacool fittings only.