Reducing Tee, Slip x Slip x FPT PVC Schedule 40 1/2" x 1/2" x 1/8" (402-071)

This 1/2" x 1/2" x 1/8" Schedule 40 PVC Tee (Slip x Slip x FPT) provides a three-way mixed-connection junction that incorporates a 1/8" female NPT-threaded instrument tap or micro-bore service port directly into a 1/2" socket pipe run — allowing a pressure gauge, bleed valve, vent fitting, test point, or micro-bore instrument connection to be installed permanently at any point along a 1/2" all-socket PVC assembly without interrupting the run or requiring a separate adapter assembly at the tap location. Constructed in white Schedule 40 PVC, it is the most specialized confirmed branch configuration in the 402 series — serving applications where a 1/8" threaded micro-bore port must be incorporated into a 1/2" socket run at the tee location.

The two 1/2" slip socket run ends accept 1/2" PVC pipe for permanent solvent-cement bonds forming the continuous inline run, while the 1/8" FPT branch outlet accepts any standard 1/8" male NPT-threaded instrument fitting, pressure gauge, bleed valve, vent plug, test point nipple, or micro-bore service component for a pressure-tight mechanical connection when made up with thread sealant or PTFE tape. The 1/8" FPT is the smallest standard NPT thread size in common commercial use — serving exclusively as an instrument monitoring port, bleed or vent connection, or micro-bore test point rather than a flow service branch; no meaningful flow service function is performed by a 1/8" branch in a 1/2" distribution run, and the fitting should be selected specifically when a permanent instrument tap point is required at the tee location rather than when a flow-carrying branch connection is needed. This fitting is distinct from the adjacent 402-074 (1/2" x 1/2" x 3/4" FPT branch bullhead, confirmed in this catalog session), which provides a larger branch outlet for flow consolidation or distribution applications, and from any full-size 402 series entry at the same run diameter, which provides an equal-size FPT branch for standard branch flow service. At the 1/8" branch size, this tee is most commonly specified in chemical processing, water treatment, laboratory fluid systems, small-bore irrigation pump station assemblies, and instrument distribution manifolds where pressure monitoring taps, bleed ports, vent connections, and test point access must be built into 1/2" socket PVC runs at the lowest possible installation footprint and without interrupting the mainline run.

Rated to approximately 600 psi at 73°F (governed by the 1/2" slip run ends), this tee is suited for standard commercial and light industrial pressure service. NSF/ANSI 61 listing confirms suitability for potable water contact.

Apply solvent cement to both the pipe end and fitting socket at each run port per ASTM D2564 procedures, inserting fully and maintaining a quarter-turn during assembly. On the 1/8" FPT branch, use PTFE tape — wrapping a minimum of two to three times in the thread direction — and confirm that the 1/8" male NPT component is started by hand and seated squarely before applying any additional torque; at 1/8", the thread engagement depth is the shallowest of any standard NPT size, making cross-threading a particularly common installation error; a cross-threaded 1/8" joint may crack the female thread interior without being immediately apparent under hand pressure alone. Avoid over-torquing — PVC threads require hand-tight plus approximately one turn at 1/8"; the margin between proper engagement and overtorque is extremely narrow at this size. Allow adequate cure time on the cemented run joints before pressurizing the system, and derate pressure ratings for elevated temperatures per published derating curves.

Specifications:

Industries & Applications:

• Chemical Process Piping — Incorporates 1/8" male-threaded pressure gauge taps, bleed valve stubs, vent connection ports, and micro-bore instrument fittings directly into 1/2" socket PVC chemical distribution runs, feed lines, and manifold assemblies in chemical processing and water treatment facilities where instrument monitoring access must be built into small-bore socket runs at the most compact possible tap point without a separate adapter assembly
• Industrial Process Piping — Provides 1/8" male-threaded pressure transducer connections, temperature sensor ports, bleed valve stubs, and test point fittings at inline locations along 1/2" socket process water distribution, sample system, and instrument supply runs in manufacturing and laboratory facilities where micro-bore instrument access at small-bore PVC socket runs is required throughout the distribution layout
• Irrigation & Water Distribution — Adds 1/8" male-threaded pressure monitoring taps, test point connections, and bleed valve stubs directly into 1/2" socket irrigation supply lines, pump station piping, and small-bore distribution runs in agricultural and residential irrigation systems where system pressure verification points must be incorporated without interrupting the 1/2" socket pipe run
• Water Treatment & Aquaculture — Used at inline instrument monitoring points, bleed and vent locations, and test point access positions along 1/2" socket process and distribution runs where 1/8" male-threaded pressure monitoring instruments, sampling valves, or bleed fittings must be permanently incorporated at the tee location with NSF/ANSI 61 compliance required throughout
• Laboratory & Analytical Systems — Provides a 1/8" female-threaded instrument port at inline locations along 1/2" socket PVC fluid distribution runs in laboratory, analytical, and pilot plant systems where micro-bore instrument connections, bleed ports, and test point access are specified at the smallest standard NPT thread size throughout the distribution assembly
• Commercial Plumbing — Incorporates 1/8" male-threaded pressure gauge connections, test point stubs, and bleed ports at specific monitoring locations along 1/2" socket PVC distribution pipe runs in commercial building water systems where instrument access must be built into the run without interrupting the all-socket assembly or requiring a separate adapter fitting at the tap location