A 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 fails, symptoms often include poor circulation, uneven filtration, internal leaks, or DE bypass returning to the pool. Replacing the manifold with a properly engineered part like the Valpak V38-140 is a critical step in bringing your system back to normal operation without replacing the entire filter.

Restores Proper Flow & Filtration Performance

The top manifold plays a key role in directing filtered water out of the grid assembly and back to the pool. The Valpak V38-140 is precision-molded to match the fit and function of the original Pentair FNS Plus manifold, ensuring tight seals at the grid connections and consistent water flow through the filter.

This replacement manifold is ideal for service repairs, rebuilds during grid replacement, or correcting internal filter leaks caused by aging plastic components.

Built for Durability in DE Filter Environments

DE filters operate under pressure and chemical exposure that can weaken inferior plastics over time. Valpak manufactures the V38-140 using reinforced, chemical-resistant materials designed to withstand:

• Continuous pressure cycling

• Exposure to pool chemicals and DE media

• Heat and UV stress inside the filter tank

The result is a long-lasting manifold that holds its shape, seals properly, and maintains filtration efficiency season after season.

Why the Top Manifold Matters

• Ensures even water distribution across all DE grids

• Prevents internal bypass that allows debris back into the pool

• Maintains proper pressure and flow through the filter

• Protects grids from uneven stress and premature failure

A compromised manifold doesn’t just reduce water clarity—it can shorten the life of your entire DE grid assembly.

OEM-Equivalent Fit for Pentair FNS Plus Filters

The Valpak V38-140 is designed as a direct replacement for Pentair OEM part #59023300 used in FNS Plus DE filters. It installs cleanly onto compatible grid assemblies without modification, making it a dependable choice for professional technicians and experienced pool owners alike.

If you’re already opening the filter for grid replacement or deep cleaning, replacing an aging manifold at the same time is a smart preventative repair.

Product Specifications

Buy with Confidence from Benchmark Pool Supply

When you purchase the Valpak V38-140 FNS Plus Top Manifold from Benchmark Pool Supply, you’re getting more than just a replacement part—you’re getting expert-backed confidence. Our team understands real-world pool equipment failures and stocks proven components that installers and service pros trust.

If you’re rebuilding or repairing a Pentair FNS Plus DE filter, this manifold delivers reliable performance without the OEM price tag.