This is the water flow sensor paddle retaining pin for the water flow sensors used in Bestway brand inflatable hot tubs. This includes both the Coleman and Lay-Z-Spa brands of tubs which are also made by Bestway. If you have ever tried troubleshooting the E02 error and pulled your water flow sensor apart to inspect it and have broken the small plastic pin that holds the sensor paddle in place, This is the part you need to replace it. If you need a replacement magnetic paddle, I sell them in 2 different kits. One kit is just the replacement paddle and retaining pin which can be purchased by clicking here. The other kit contains the replacement paddle, the retaining pin and the rubber o-ring seal for the flow sensor cap. It should be noted that the o-ring seal is meant for the older egg style pumps. This replacement kit can be purchased by clicking here. The water flow sensor paddle retaining pin is a hard part to find, get yours now.