Review on Waterpik Sensonic Complete Care Standard Brush Heads - Replacement Toothbrush Heads, SRRB-3W, 3 Count | Top-Quality Oral Care by Kathleen Good

They "fit" my Waterpik brush and technically still work, but the brush head will not fully seat onto the brush housing drive shaft. It leaves a gap of about 1/16 inch between the head and body. Looks like a ghetto and drains additional sewage into the rift with unknown effect. 3/5 stars. Update: Added photos demonstrating installing the head with green. the tape that originally came with the machine and the one I bought here with the bureaucracy. Now I've bought the same set of 3 twice and both times (all six heads) with this gap. I won't buy them again. Changed rating to 2/5 stars due to same issue happening again. It doesn't take space age engineers to get them right. Getting the driveshaft wet didn't break it, at least the motorized crank.