With Eheim Install Sets 1 and 2, all external filter makes with hose diameters of 0.50"/0.65" can be perfectly optimised in the suction or pressure area. Firm connection with variable installation and selective function is ensured by the plug-in connections.Eheim Installation Set 1 improves the suction effect through its piping that creates a current-like flow and the compact overflow arc that is fitted with a practical quick release coupling. At the same time, the set can be used as a suction aid for external filters that have a shut-off device in the suction area. Otherwise an additional shut-off valve is installed there. In addition, the opening with a closing cap in the overflow arc can be used to clean pipes and hoses conveniently.In the flow area Installation Set 2 ensures optimum pressure conditions with variable installation options. The water outlet can be adapted to the aquarium dimensions by means of the plug-in nozzle tubes, the hoses can be connected safely thanks to the quick release coupling, and the set can be easily cleaned via the closing cap on the overflow arc. A separate nozzle set including an elbow and three different attachments as a wide jet, outlet or adapter for connecting a diffusor is also available as an accessory.Eheim Installation Set 2 (Pressure Side) A variety of outlet possibilities Modular assembly Suitable for all aquarium heights and external filters Simple and safe tube connections with the new quick-release coupling Trouble-free cleaning of hoses Simple air discharge