Pentair 191486 Complete Grid Assembly Replacement Star Pool and Spa D.E. Filter Complete grid assembly replacement Fits Pentair Star pool and spa D.E. filter models ST40, ST50 Assembly consists of manifold assembly, 13-1/8-inch grid model, grid bottom retainer, 20 serrated stainless steel 1/4-hex nut, rod and 1/4-inch stainless steel washer lock Measures 7-1/2-inch length by 11-inch height by 22-inch width