Pentair FNS Plus Inlet Pipe Assembly with Bulkhead

The Pentair FNS Plus Inlet Pipe Assembly with Bulkhead (part number 59023500 or 59023500Z) is a specialized internal plumbing connection assembly engineered exclusively for the lower intake port of Pentair FNS Plus Diatomaceous Earth (D.E.) pool and spa filtration systems (including models FNS Plus 24, 36, 48, and 60). Injection-molded from thick-walled, high-impact PVC and ABS thermoplastic polymers, this pre-assembled internal manifold features a heavy-duty threaded bulkhead shaft mated to a rigid, directed inlet pipe. Its primary operational role is to pass directly through the lower composite filter tank shell to link with the external multiport or slide valve, receiving the raw, high-velocity incoming pool water. Internally, the assembly securely directs this turbulent hydraulic stream away from the delicate fabric pleats of the D.E. grid array and toward the bottom perimeter of the tank, establishing a balanced fluid dynamic while safely containing continuous internal system operating pressures up to 50 PSI without weeping, leaking, or experiencing structural bypass. Built to endure constant submersion in highly chlorinated water, abrasive media friction, and intense pump vibration surges, its robust plastic architecture resists cracking and material fatigue. Due to its thick-walled, multi-component plumbing design engineered to handle standard residential and commercial flow rates, this individual inlet pipe and bulkhead assembly carries a net product and shipping weight of approximately 1.20 to 1.45 pounds (about 19.2 to 23.2 ounces).