The Intake system is designed for maximum flexibility due to the wide range of setups and species using this filter. They range from commercial aquariums to home users and turtles to large game fish.
You can easily use some silicone sealant (glue) to hold the pieces together and keep larger fish from loosening them and causing air leaks. The reason we recommend that type glue is it can be undone easily and is safe for whatever is in the tank once it drys.