Pentair Filter Pipe Inlet

The Pentair Filter Pipe Inlet Assembly (primarily part number 190043) is an internal fluid-routing hardware component engineered exclusively for the lower basin of Pentair FNS Plus series Diatomaceous Earth (D.E.) filtration systems, spanning the FNSP24, FNSP36, FNSP48, and FNSP60 models.

Injection-molded from heavy-walled, high-impact PVC and ABS engineering plastics, this pre-assembled plumbing section measures approximately 11-3/4 inches in length, 3-1/2 inches in height, and 3-1/2 inches in width. It features an integrated 2-inch bottom bulkhead adapter (part number 178575) pre-fitted with high-density elastomeric sealing O-rings.

The primary operational role of this assembly is to serve as the structural gateway for raw, unfiltered pool water as it enters the high-pressure filter tank. Water pushed from the circulation pump passes through the external plumbing and into the lower bulkhead, where the unyielding inlet pipe channels the turbulent stream inward and releases it safely at the absolute bottom of the tank chassis. By controlling the fluid trajectory, it prevents the incoming high-velocity water from directly blasting or tearing the delicate fabric-wrapped filter grids positioned above it. This directional flow management allows the pressurized vessel to sustain continuous system operating parameters up to 50 PSI while mitigating localized pressure spikes and keeping internal media distribution balanced.

Built to remain permanently submerged in a highly dynamic, chemical-laden environment, its rugged plastic composition completely resists structural warping, material brittleness, and advanced corrosion from prolonged exposure to high-strength sanitizers like chlorine, bromine, and seasonal scale-remover acid flushes. Due to its solid plastic plumbing profile and heavy integrated bulkhead hardware, this complete replacement inlet pipe assembly carries a net product and shipping weight of approximately 0.80 to 1.15 pounds (about 12.8 to 18.4 ounces).