Keeping all of your spa's pieces up-to-date and working properly is the best way to prolong your enjoyment of the spa. Even the smallest pieces of your spa are important to care for with regular maintenance. The 2 Inch, Grey Diverter Cap (1999 to 2002) by Master Spas is an exact replacement piece for your home spa’s original water diverter valve cap. This particular piece measures 3 ⅜” in diameter and is used with all water diverter valves with two-inch plumbing. Keeping your water diverter valve in good condition allows you to properly control the flow of water in your home spa.