Stops kinks occuring with airline or CO2 tubing.

Kinks cause problems with tubing, it stops the flow rate considerbly. In CO2, insufficient flow rates cause major issues. A disruption of CO2 causes algae to grow.

With an air pump you starve your filter or whatever else you are powering of oxygen.

CO2 tubing and airline tubing easily slips onto the elbow connectors.

The elbow connectors stops all these problems and are an affordable investment.