90 Degree Elbow, FPT x FPT PVC Schedule 80 4" (808-040)

The 4" PVC Schedule 80 90 Degree Elbow (808-040) is a heavy-duty, all-threaded direction-change fitting that routes a 4" piping run through a clean 90° turn using female pipe thread (FPT) connections on both ends. The fully threaded configuration means both connections accept male-threaded (MPT) pipe, nipples, or fittings — making every joint in this elbow mechanical and removable without cutting or solvent welding.

This all-FPT design is the correct choice when the elbow itself — or the piping on either side of it — needs to be serviceable. Threaded joints can be broken and reassembled for system modifications, equipment maintenance, or replacement without disturbing surrounding piping. In industrial environments where process changes, equipment upgrades, or routine maintenance are facts of life, an all-threaded fitting like the 808-040 delivers meaningful long-term operational flexibility that a solvent-welded elbow cannot.

Schedule 80's significantly thicker wall construction compared to Schedule 40 provides elevated pressure ratings, greater resistance to mechanical impact and stress, and superior performance in elevated-temperature and chemically aggressive service environments. The dark gray PVC composition is the recognized industry standard for Schedule 80 fittings, signaling at a glance that the system is built for demanding conditions beyond standard residential or light commercial use.

Built to ASTM D2467 standards, the 808-040 is dimensionally consistent and thread-cut to NPT (National Pipe Taper) specification, ensuring reliable sealing with appropriate thread sealant or PTFE tape and a predictable fit across standard-compliant male-threaded components.

Specifications:

Industries & Applications:

Chemical Processing & Industrial Fluid Handling Threaded fittings are standard in chemical processing environments where piping systems require frequent reconfiguration, equipment swaps, and maintenance access. The all-FPT 90° elbow allows chemical feed lines, transfer headers, and injection loops to change direction at any point in the run while keeping every joint mechanically removable. Schedule 80 wall thickness withstands the pressures and chemical exposures — acids, caustics, and oxidizing solutions — that disqualify Schedule 40 from these applications.

Industrial Pump Discharge & Equipment Connections Pump discharge piping frequently requires a 90° turn within a short distance of the pump outlet, and threaded connections at the elbow allow the fitting to be removed for pump service or replacement without cutting the line. The 4" size is common at mid-range centrifugal pump discharges in industrial cooling, pressure boosting, and fluid transfer applications.

High-Pressure Irrigation & Agricultural Water Systems Mainline and sub-main irrigation systems operating at elevated pressures — particularly those serving commercial greenhouse operations, large-scale drip systems, or high-head orchard irrigation — use Schedule 80 threaded fittings at direction changes near pump stations and control valve assemblies where system pressure and UV or chemical exposure make Schedule 40 insufficient.

Water & Wastewater Treatment Treatment plant chemical dosing systems, chlorination feed lines, polymer injection loops, and backwash headers use threaded Schedule 80 fittings for their combination of chemical resistance and maintainability. A threaded 90° elbow at a direction change in a chemical feed line allows the run to be broken and chemically decontaminated or replaced without cutting into the piping system.

Marine, Aquaculture & Hatchery Piping Saltwater and brackish water systems in marine facilities and recirculating aquaculture systems (RAS) use Schedule 80 PVC throughout to handle the combined stress of continuous pressure, biofouling treatments, and saline chemical exposure. Threaded elbows at tank supply headers and distribution manifold direction changes allow individual branch lines to be reconfigured as stocking densities and tank layouts change.

Industrial HVAC & Cooling Tower Systems Chemical treatment of cooling tower water — scale inhibitors, biocides, and corrosion inhibitors — makes metallic fittings a liability in recirculating loop piping. Schedule 80 PVC threaded elbows in 4" cooling water supply and return lines provide corrosion-free direction changes with the service access that large commercial HVAC systems require at annual maintenance intervals.