I wanted an easy way to disperse the water flow to all sides of my grow tower so I came up with this. The pump is mounted below in the reservoir and the hose goes up through the center of the diffuser and trickles down through the progressively larger holes.

It is designed for a 5" square PVC fence post but can be scaled up or down if needed. You can mount it by running screws through the post for the part to rest on or (what I did) drill and tap the part and run screws from the inside out to bind on the post without penetrating it. A clamp above the diffuser keeps the hose from falling back through the hole.

Picture is from an earlier version but the flush center post worked better. The new version is installed and running.