ValPak V38-140 FNS Plus Top Manifold ReplacementA cracked or worn top manifold can cripple the performance of an otherwise healthy DE filter. The Valpak V38 140 FNS Plus Top Manifold is a heavy duty replacement designed to restore proper water distribution, sealing, and filtration efficiency in Pentair FNS Plus DE filter systems. Built to OEM equivalent standards, this manifold ensures even flow across the grid assembly, helping your filter operate at peak efficiency once again. When a top manifold