Pentair 50181311 2-Inch Threaded Side Mount Multiport Pre-Plumbed Valve Replacement Pool and Spa Filter Side mount multiport valve replacement Fits Pentair Eclipse 26-inch, 30-inch, 36-inch sand filters 125 GPM (2-inch side mount) 100 percent factory tested Site glass included; measures 14-3/4-inch length by 20-1/2-inch height by 10-inch width