When installing new diffuser piping or repairing damaged outlets in existing piping, these diffuser mounts save you a lot of time and aggravation. Just drill a 1-1/4" hole, press in the self-locking diffuser mount, and screw in the diffuser. Once installed, there is virtually no way that diffusers can blow out.
Glue the PVC mount flange to PVC or ABS pipe if additional gripping strength is desired. Note: Mounts are not designed for horizontal mounting of tube or SS coarse bubble diffusers.