Pentair 190035 Standpipe Outlet Assembly Replacement FNS Plus FNSP 36 Pool and Spa Vertical Grid D.E. Filter Standpipe outlet assembly replacement Fits Pentair FNS Plus 36-square feet pool and spa vertical grid D.E. filter model FNSP 36 Measures 15-1/2-inch length by 3-1/2-inch height by 3-1/2-inch width