Tee, Slip x Slip x FPT PVC Schedule 80 4" x 1-1/4" (802-418)

The 4" x 1-1/4" PVC Schedule 80 Tee (802-418) combines a 4" slip x slip inline run with a 1-1/4" female pipe thread (FPT) branch outlet — a Schedule 80 mixed-connection tee designed for industrial process piping and chemical handling systems where a small-to-moderate-diameter, threaded, removable service connection must tap directly into a 4" primary run in a single compact, pressure-rated fitting. The two 4" slip ports accept standard Schedule 80 pipe for permanent, solvent-welded inline joints, while the 1-1/4" FPT branch accommodates any standard 1-1/4" male-threaded valve, instrument, strainer, chemical injection assembly, equipment inlet, or service connection that requires periodic removal or replacement without disturbing the solvent-welded 4" run on either side.

Stepping one branch size above the 802-417 (1" branch) in the 802-series 4" mixed-connection tee lineup, the 802-418 serves the upper end of the small-service-connection range — where the branch carries enough flow capacity to support a meaningful secondary service function off the primary 4" header. At 1-1/4" FPT, the branch is large enough to handle dedicated equipment supply connections, small recirculation loops, bypass lines, chemical dosing headers, and low-to-moderate-flow secondary service runs in addition to the valve isolation and instrument tap applications that smaller branches in the series serve. The 1-1/4" branch size is a less common nominal pipe size than 1" or 1-1/2", and buyers sourcing the 802-418 are almost always doing so from an engineering document or equipment specification where 1-1/4" NPT is the precise thread size called out at the branch connection — a pump port, a strainer inlet, a valve body, or an equipment interface where this exact thread size is specified rather than approximated from adjacent sizes.

The mixed slip-and-thread configuration delivers the core design logic of the 802-series: the two 4" solvent-welded slip ports create permanent, pressure-rated inline joints that become part of the surrounding Schedule 80 assembly, while the 1-1/4" FPT branch preserves full downstream serviceability — allowing the threaded valve, instrument, strainer, or equipment connection at the branch to be removed and replaced as maintenance, inspection, or system reconfiguration requires, without cutting into or disturbing the primary 4" run. The single-fitting integration eliminates the reducer bushing and threaded adapter that a conventional multi-fitting branch assembly would require at this size differential, reducing joint count and keeping the branch point compact and clean within the surrounding system.

Manufactured to Schedule 80 specifications and dimensionally compliant with ASTM D2467, the 802-418 delivers the elevated wall thickness and pressure rating that Schedule 80 gray PVC is specified for in chemical processing, industrial fluid handling, and demanding commercial applications. Gray PVC construction provides broad chemical compatibility with acids, alkalis, and industrial process fluids. NSF 61 certification confirms suitability for potable water contact where required.

Specifications:

Industries & Applications:

• Chemical Processing — dedicated equipment supply connections, chemical dosing headers, strainer inlets, and 1-1/4" valve isolation branches off 4" process fluid and chemical distribution headers where a single-fitting integrated branch eliminates a multi-fitting assembly at the tap point
• Industrial Process Piping — small recirculation loops, bypass lines, low-to-moderate-flow equipment supply connections, and 1-1/4" service branch takeoffs from 4" plant utility and process fluid headers in Schedule 80 systems where the branch serves a component requiring periodic removal or service access
• Water & Wastewater Treatment — small equipment supply, chemical dosing, and service branch connections in treatment plant process piping where a 4" Schedule 80 slip run and 1-1/4" threaded branch are called out together in the system design documents
• Commercial & Industrial Plumbing — 1-1/4" equipment supply, strainer, and small valve branch connections in high-pressure Schedule 80 mechanical systems where the branch serves a dedicated service or equipment interface off a primary 4" distribution header
• Aquaculture & Food Processing — equipment supply, chemical injection, and service branch fittings in recirculating systems and chemical-exposure fluid handling installations requiring Schedule 80 pressure and chemical resistance at the tee body with a removable 1-1/4" threaded branch outlet
• Irrigation & Agriculture — dedicated equipment supply connections, strainer branches, and chemical injection headers off 4" Schedule 80 high-pressure primary distribution headers where a removable 1-1/4" threaded branch is specified for injection, filtration, or control equipment