Pentair 50181212 1-1/2-Inch Threaded Side Mount Multiport Pre-Plumbed Valve with Plumbing Kit Replacement Pool and Spa Filter Side mount multiport valve replacement Fits Pentair pool and spa D.E. filters 100 GPM (1-1/2-inch side mount) 100 percent factory tested Site glass included; measures 17-3/4-inch length by 8-1/2-inch height by 11-1/2-inch width