For Wellis spa Wellis Reference : AF00031 Dimensions: Length: 220mm Width: 165mm Colour: Light Grey Distance between fixings : 135mm Looked after properly, spa headrests will last for many years. Cracking, discolouring or generally degrading headrests are often an indication that your sanitiser levels are too high. To protect your hot tub pillows, run the jets for at least 15 minutes after you add chemicals to the water. Be sure to leave the cover off when you do this. The chlorine fumes can then escape. Never add chemicals and then replace the cover right away. Doing this will cause both the pillows and the cover to deteriorate quicker. Always remember to remove your headrests when your spa is not in use, this will prolong the lifespan and help prevent chemical damage. Headrests that have been damaged due to chemical misuse will not be covered under warranty.