Tee, FPT x FPT x FPT PVC Schedule 40 1/2" (405-005)

This 1/2" Schedule 40 PVC FPT × FPT × FPT Tee provides a full-size, fully threaded branch connection in a Schedule 40 PVC pressure piping system, with all three female NPT threaded ports receiving 1/2" male-threaded pipe, nipples, MPT adapters, or male-threaded fittings. The two run ports maintain the straight-through flow path of the threaded assembly, while the branch port presents an equal 1/2" FPT opening perpendicular to the run — delivering a threaded branch connection without solvent cement, primer, or cure time at any of the three ports.

The all-threaded FPT × FPT × FPT configuration is the defining characteristic that places the 405-005 within the three-way tee series at 1/2" Schedule 40. The 401-series all-socket tee serves fully solvent-welded systems where all three connections are cemented PVC pipe ends — correct wherever the branch continues as a cemented pipe run throughout. The 402-series mixed-connection tee (Slip × Slip × FPT) serves hybrid systems where the run is cemented PVC pipe but the branch requires a female-threaded outlet for a downstream threaded component. The 405-005 serves fully threaded assemblies where all three connections receive male-threaded nipples, MPT adapters, or MPT-terminated fittings — no cement work is performed at the tee body, and all three joints are made up with PTFE tape and thread sealant. When all three connections at the tee position are threaded, the 405-005 is the correct selection.

The 405-005 is the Schedule 40 counterpart to the 805-005 (1/2" Schedule 80 FPT × FPT × FPT Tee, previously written). Both accomplish the same all-threaded equal tee function — the sole distinction is schedule. The 805-005 serves Schedule 80 systems in dark gray PVC at the higher Schedule 80 pressure rating; the 405-005 serves Schedule 40 systems in white PVC at the Schedule 40 pressure rating. At 1/2", the elevated pressure rating even at Schedule 40 makes the 405-005 well suited for the full range of residential, commercial, and light industrial threaded system applications at this small-bore pipe size.

At 1/2", the all-threaded FPT × FPT × FPT tee serves a specific and well-defined set of system types. Chemical dosing and injection systems — built from threaded fittings and nipples for disassembly access and chemical compatibility — rely on the 405-005 at every three-way branch position in the dosing header. Instrument supply distribution runs in commercial and light industrial facilities use the 405-005 wherever a 1/2" threaded instrument supply branch must be tapped off the threaded run. Control system piping, chemical treatment connection assemblies, and compact threaded process connections all position the 405-005 as the standard all-threaded branch fitting at every tee position in the 1/2" threaded layout. The threaded construction allows these systems to be built, modified, and maintained without cement work at any tee position — each joint can be made up and broken out independently throughout the service life of the installation.

The all-threaded construction also makes the 405-005 the correct fitting for retrofit and repair work in existing 1/2" threaded Schedule 40 systems where a branch connection must be added without cutting solvent-cemented pipe or introducing cement work into the established threaded assembly. Threading out a straight coupling or union from an existing threaded run and threading in the 405-005 extends the system with a full three-way branch at the insertion point.

Manufactured in white Schedule 40 PVC, this tee delivers reliable performance across residential, commercial, and light industrial threaded piping applications. PVC's broad chemical resistance covers acids, bases, salts, chlorine, and most common process fluids, providing long service life in corrosive environments where metal tees would corrode, scale, or contaminate chemical dosing and instrument supply lines. NSF/ANSI 61 and NSF/ANSI 14 listings confirm suitability for potable water contact.

Rated to approximately 600 psi at 73°F, this tee handles standard to elevated pressure service across the full range of 1/2" Schedule 40 PVC threaded applications. Apply PTFE tape or compatible pipe thread sealant to all male threads engaging each FPT port before assembly. Hand-tighten each connection plus one to two turns — do not over-torque PVC female threads at any of the three ports. When assembling a nipple-tee-nipple run, make up all three ports evenly and avoid applying excessive torsional stress to one port while tightening the others. Apply published pressure derating factors for service temperatures above 73°F.

Specifications:

Industries & Applications:

• Chemical Dosing & Injection Systems — The defining application for the 1/2" Schedule 40 all-threaded FPT tee: provides a full-size 1/2" FPT branch at every three-way branch position in chemical dosing headers, injection quill supply runs, reagent distribution assemblies, and dosing loop branch connections in water treatment, commercial plumbing, and agricultural chemical handling systems where fully threaded Schedule 40 construction is specified for disassembly access and the 1/2" all-threaded tee serves each branch junction in the dosing assembly
• Instrument Supply & Control System Piping — Provides a full-size 1/2" all-threaded branch at every distribution branch position in instrument supply runs, control panel distribution assemblies, analyzer sample conditioning supply lines, and monitoring station connection headers in commercial and light industrial Schedule 40 systems where fully threaded construction allows branch connections to be added and modified without cement work at the tee position
• Fully Threaded Schedule 40 Systems — Branches a 1/2" threaded run at every three-way junction in mechanical rooms, equipment bays, process connection assemblies, and compact threaded pipe layouts built entirely with threaded Schedule 40 PVC components — the standard all-threaded branch tee at every 1/2" threaded branch position throughout fully threaded Schedule 40 system layouts
• Commercial Plumbing — Provides a 1/2" all-threaded branch connection in mechanical room and building utility system threaded piping assemblies where the system is constructed with threaded fittings and nipples; used for branch connections in threaded 1/2" supply runs serving equipment, fixtures, and secondary distribution points in commercial building systems
• Residential & Light Commercial Irrigation — Used in fully threaded 1/2" Schedule 40 irrigation control assemblies, chemical injection headers, and compact valve connection runs at three-way branch positions where all connections are male-threaded nipples or MPT-terminated fittings and fully threaded construction is specified for serviceability
• Water & Wastewater Treatment — Provides a full-size 1/2" FPT branch at three-way branch positions on chemical dosing supply lines, instrument connection runs, and secondary distribution headers in light-duty municipal and industrial water treatment facilities where threaded construction is used at chemical feed and instrument connection points requiring periodic maintenance and modification access
• Threaded System Repair & Extension — Provides a full three-way threaded branch at a 1/2" inline position in existing Schedule 40 threaded systems where a branch connection must be added without cutting solvent-cemented pipe — threading out a straight coupling from the existing threaded run and threading in the 405-005 introduces a full-size branch at the insertion point without cement work