This pillow is similar to the tubular pillow (8515045) however this one has an opening in the centre for the Hydropool Waterfall Feature. 

This pillow can be used as a replacement for waterfall pillows on Self Clean Spas and Swim Spas produced after November 2015

It is held into place with a tongue & groove design on the side of the pillow.

*In order to prevent damage to your pillows caused by the gassing effect of chemicals, we recommend removing them when the spa is not in use. Doing so will extend the life of your pillows.