Tee, FPT x FPT x FPT, PVC Schedule 80 4" (805-040)

The 4" PVC Schedule 80 Tee (805-040) is a heavy-duty, all-threaded three-port branch fitting that delivers a full 90° branch outlet off a 4" run using female pipe thread (FPT) connections on all three ports. Every connection in this tee is mechanical and removable — the run ports accept male-threaded pipe, nipples, or adapters on both ends, and the branch outlet does the same, making the entire fitting assembly serviceable at any port without cutting or solvent welding.

The all-FPT configuration is the defining feature of the 805-040 and the primary reason to specify it over a slip tee. In industrial, chemical, and process piping environments where branch lines serve equipment that requires periodic maintenance, replacement, or reconfiguration, threaded joints provide access that welded joints cannot. Any port in this tee can be broken and reassembled independently — isolate and service the branch without disturbing the run, or break the run at either end without affecting the branch connection. That operational flexibility has real value in systems that are expected to evolve or require scheduled maintenance access over their service life.

Schedule 80 PVC construction brings substantially greater wall thickness than Schedule 40, yielding higher pressure ratings, improved resistance to mechanical impact and thermal cycling, and reliable performance in the chemically aggressive and elevated-pressure environments where all-threaded Schedule 80 fittings are most commonly specified. The dark gray color is the established visual identifier for Schedule 80 PVC, providing immediate confirmation at inspection or maintenance that the system meets industrial-grade specifications throughout.

Manufactured to ASTM D2467 standards with threads cut to NPT (National Pipe Taper) specification, the 805-040 delivers consistent thread geometry and dimensional tolerances across all three ports — critical at 4" where thread engagement depth and taper consistency directly determine the reliability of the sealed joint under sustained pressure.

Specifications:

Industries & Applications:

Chemical Processing & Industrial Fluid Handling All-threaded tees are a foundational component in chemical processing piping where branch lines serve injection points, sampling ports, pressure relief connections, and chemical feed equipment that must be accessed and serviced on a defined maintenance schedule. The 4" FPT tee allows the branch and run connections to be broken independently at any port, supporting equipment changeouts and chemical line modifications without system-wide disruption. Schedule 80 wall thickness handles the pressures and corrosive media — acids, caustics, oxidizers, and industrial solvents — that eliminate Schedule 40 from these environments.

Industrial Pump & Compressor Discharge Headers Pump discharge headers at 4" commonly require a branch takeoff for pressure gauges, pressure relief valves, recirculation lines, or bypass loops. A threaded tee at the branch point allows gauge assemblies and valve bodies to thread directly into the fitting and be removed for calibration or replacement without affecting the main discharge run. The elevated pressure rating of Schedule 80 ensures the tee meets the discharge-side pressure requirements of mid-range industrial centrifugal and positive displacement pumps.

Water & Wastewater Treatment Systems Chemical dosing infrastructure in water and wastewater treatment — chlorination systems, coagulant and polymer feed lines, pH adjustment loops, and fluoridation headers — uses all-threaded Schedule 80 fittings throughout for their combination of chemical resistance and service accessibility. A threaded tee at a branch point in a chemical feed header allows dosing injectors, isolation valves, and flow meters to be removed and replaced during routine maintenance without cutting into permanently welded piping.

High-Pressure Irrigation & Agricultural Water Systems Commercial greenhouse operations, high-head drip irrigation systems, and fertigation distribution headers operating at pressures that exceed Schedule 40 limits use Schedule 80 threaded fittings at branch points near pump stations and control valve assemblies. The all-FPT tee allows filter stations, pressure regulators, and fertigation injectors to be threaded directly into the distribution header and serviced at seasonal maintenance intervals.

Marine, Aquaculture & Hatchery Piping Recirculating aquaculture systems (RAS), marine hatcheries, and public aquarium life support systems use Schedule 80 PVC throughout their distribution piping to handle continuous pressure, ozone and UV treatment chemical exposure, and saline water chemistry. Threaded tees at branch points in biofilter supply headers, oxygen injection manifolds, and tank distribution arrays allow flow control valves and monitoring equipment to be reconfigured as production protocols and stocking densities change.

Industrial HVAC, Cooling Tower & Process Cooling Cooling water distribution systems where chemical treatment — biocides, scale inhibitors, and corrosion inhibitors — makes metallic piping unsuitable use Schedule 80 PVC threaded fittings at branch points for chemical injection connections, bypass headers, and equipment isolation valves. The 4" size is appropriate for mid-size cooling tower supply and return headers serving multiple air handling units or process heat exchangers, where branch access points must survive the chemical and thermal cycling of year-round commercial HVAC operation.

Fire Suppression & Industrial Safety Systems In industrial facilities where PVC is code-permissible for fire suppression applications, Schedule 80 threaded tees provide the pressure ratings and chemical resistance required in sprinkler feed mains, foam suppression distribution headers, and deluge system branch lines. The all-FPT configuration allows isolation valves, test connections, and pressure gauges to be threaded directly into the distribution header without welded stub-outs or additional adapter fittings.