Pentair 60 SqFt FNS Plus Tie Rod

The Pentair 60 SqFt FNS Plus Tie Rod (part number 59002300 or 59002300Z) is a critical internal structural fastener machined from high-tensile, corrosion-resistant stainless steel, engineered exclusively for the maximum-capacity grid matrix configuration of Pentair FNS Plus 60-square-foot Diatomaceous Earth (D.E.) pool and spa filtration systems (model FNSP60). Measuring exactly 33.5 inches ($33-1/2"$) in length with a slim 1/4-inch structural rod diameter, this specialized replacement hardware features threaded tips on both ends to serve as the high-tension vertical spine locking the entire filtering core together.

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The rod threads straight through the center of the upper plastic manifold, extending through the continuous vertical channel of the eight-piece D.E. grid nest to anchor firmly into the lower collector hub assembly. When the upper brass wing nut is torqued down, the tie rod generates immense axial compression that clamps the top manifold and bottom hub securely against the 30-inch tall individual grid elements, maintaining a completely rigid structural alignment. This mechanical clamping prevents the large grids from tilting, warping, or shifting under turbulent water circulation and heavy backwash flow reversals. By enforcing a flawless hydraulic seal against the internal alignment seats, it completely prevents unfiltered water or loose D.E. powder from bypassing the media core and returning to the pool, allowing the large-format vessel to safely manage massive water turnover velocities and sustain continuous internal operating pressures up to 50 PSI without structural failure. Built to remain permanently submerged at the absolute center of the pressurized filter core, its commercial-grade stainless steel construction completely resists advanced oxidation, rusting, material stretching, and chemical degradation from prolonged contact with high-strength sanitizers like chlorine, bromine, or routine scale-remover acid flushes. Due to its slender, solid metal rod profile, this individual 60-square-foot replacement tie rod carries a nominal product and net shipping weight of approximately 0.35 to 0.45 pounds (about 5.6 to 7.2 ounces).