Pentair O-Ring Compression Kit with Hardware

The Pentair Ring Compression Kit with Hardware (part number 178820) is a critical high-pressure structural containment and fastening assembly engineered exclusively for sealing the main body halves of specialized pool and spa filtration systems. This genuine original equipment manufacturer (OEM) replacement kit is standard hardware designed specifically for the perimeter mating tracks of Pentair FullFloXF® 4000-Series Diatomaceous Earth (D.E.) and high-capacity cartridge filtration lines.

Molded from high-strength, impact-resistant engineered thermoplastic polymers, the kit forms a heavy-duty physical locking band accompanied by all necessary factory-grade metal compression bolts and fastening hardware. Its primary operational role is to establish an absolute watertight and airtight pressure boundary directly over the main tank body O-ring at the split-tank seam. When the heavy-duty matching bolt-down points are tensioned to factory specifications using standard hand tools, the compression ring distributes mechanical clamping forces uniformly around the 360-degree lip of the tank vessel.

This precise structural reinforcement eliminates localized gaps or stress concentrations, allowing the filter chassis to safely absorb severe pump startup thrusts and securely contain the immense hydraulic circulation forces generated during high-velocity filtration cycles. By preventing weeping, seal shifting, or seam separation under heavy dynamic load shifts, the kit ensures the pressurized vessel can continuously maintain original system pressure integrity up to 50 PSI. Built to endure decades of demanding outdoor pool pad weathering, continuous internal pressure cycling, and shifting seasonal ambient temperature differentials, its premium composition fully resists structural warping, material flattening, and advanced corrosion from constant exposure to liquid pool sanitizers like chlorine, bromine, and salt-water generator outputs. Due to its rigid, structural ring frame and heavy metal fastening components, this complete replacement ring compression kit carries a standalone product weight of approximately 1.40 pounds (about 22.4 ounces).