Reducing Tee, Slip x Slip x Slip PVC Schedule 80 12" x 12" x 10" (801-670)

This 12" x 12" x 10" Schedule 80 PVC Reducing Tee (Slip x Slip x Slip) provides a heavy-duty all solvent-cement three-way junction that maintains a full 12" inline run while tapping a reduced 10" socket branch perpendicular to the run — the standard large-diameter inline trunk-with-branch configuration at the 12" x 10" size combination for municipal water distribution, large-scale industrial process piping, and large agricultural irrigation trunk main assemblies where a 12" socket transmission or primary distribution main must simultaneously continue the inline run and supply a 10" socket secondary distribution, zone header, or process supply branch. Constructed in dark gray Schedule 80 PVC, it delivers the elevated pressure performance, chemical resistance, and mechanical strength of Schedule 80 construction at large diameter, suited for demanding municipal, industrial, and large-scale agricultural applications where all-socket cemented construction is maintained throughout at trunk main and primary header diameters.

The two 12" slip socket run ends accept 12" PVC pipe for permanent large-diameter solvent-cement bonds forming the continuous inline trunk run, while the 10" slip socket branch outlet accepts 10" PVC pipe for a permanent large-diameter solvent-cement bond on the downstream reduced-diameter branch — maintaining the full 12" interior diameter through both run ends while supplying a 10" socket distribution branch perpendicular to the trunk. The 12" inline run is preserved at full diameter through the fitting body, ensuring that the flow capacity of the 12" transmission or primary distribution trunk is not reduced at the tee location while supplying the 10" branch. This standard reducing configuration — where the branch is smaller than the run — is the conventional trunk-with-branch tee serving the most common large-diameter distribution application: a 12" primary trunk continuing through the fitting while distributing to a 10" secondary header or zone supply main at the branch location. It should not be confused with the confirmed 801-591 (8" x 8" x 12" Bullhead Tee, documented in this catalog session), in which the branch is larger than the run ends for flow collection applications — 801-670 distributes from the larger 12" trunk to a smaller 10" branch while maintaining trunk continuity, while 801-591 collects flow from smaller run ends into a larger branch outlet. At 12" x 10", this reducing tee most commonly appears in large municipal water distribution systems where 12" transmission mains must supply 10" zone or district distribution headers; in large industrial process water systems where 12" cooling or process water trunk mains must supply 10" secondary distribution or equipment feed headers; and in large-scale agricultural and municipal irrigation systems where 12" primary supply mains must supply 10" secondary distribution zones or sector headers throughout the large-diameter socket grid.

Installation of large-diameter Schedule 80 PVC socket fittings at 12" and 10" requires significantly different procedures and materials than small-bore installations. Apply heavy-bodied, slow-set PVC solvent cement rated for large-diameter joints at all three ports — both 12" run end sockets and the 10" branch socket — per ASTM D2564 procedures and manufacturer guidance for fittings above 4" nominal diameter. Apply primer to both the pipe exterior and fitting socket interior at each port before cement application. Working time, cement application quantity, assembly force requirements, and cure time for large-diameter 12" and 10" joints are substantially different from small-bore procedures — follow manufacturer published procedures for large-diameter solvent cement joints precisely, including the requirement for a full-circumference cement bead at each joint face after assembly. Joints at this size require mechanical support, alignment equipment, and an adequate installation crew; support the fitting and pipe sections independently to prevent joint stress during the cure period. Full cure time before pressurization must be strictly observed per manufacturer guidelines for large-diameter joints. Derate pressure ratings for elevated temperatures per published derating curves.

Specifications:

Industries & Applications:

• Municipal Water Distribution — Taps a 10" socket secondary distribution header, zone supply main, or district feed line directly off a 12" socket transmission or primary distribution trunk in municipal water distribution systems where the 12" trunk must continue at full diameter while simultaneously supplying a 10" socket branch distribution main — the standard large-diameter trunk-with-branch configuration for municipal distribution grid primary and secondary header interconnections
• Large-Scale Irrigation — Agricultural & Municipal — Provides a 10" socket secondary distribution zone header or sector supply branch directly off a 12" socket primary supply trunk in large-scale agricultural, golf course, and municipal irrigation systems where the 12" primary supply main must continue undiminished while supplying a 10" secondary zone or sector distribution main at the branch location throughout the large-diameter socket distribution layout
• Industrial Process Piping — Taps a 10" socket secondary process water distribution header, cooling water supply branch, or equipment feed main directly off a 12" socket primary process water trunk in large industrial manufacturing, power generation, and chemical processing facilities where the 12" primary trunk must continue at full capacity while supplying a 10" secondary distribution branch at the tee location in all-socket large-diameter PVC construction
• Water Treatment & Potable Water Systems — Provides a 10" socket secondary treatment train feed, filter influent distribution branch, or secondary process header directly off a 12" socket primary influent or effluent trunk in large-scale water treatment plants where NSF/ANSI 61 compliance and all-socket large-diameter PVC construction are maintained at every primary and secondary trunk junction throughout the treatment system
• Fire Protection — Large-Diameter Grid Systems — Taps a 10" socket large-area grid zone supply or sector feed main directly off a 12" socket primary fire protection supply trunk in large commercial campus, industrial complex, and municipal fire suppression distribution systems where the 12" primary supply must continue while supplying a 10" secondary grid section at the branch junction
• Stormwater & Industrial Drainage — Provides a 10" socket branch collection or diversion run directly off a 12" socket primary collection or transmission main in large stormwater management, industrial drainage, and large-scale fluid management systems where chemical-resistant Schedule 80 PVC construction and a standard large-diameter trunk-with-branch configuration are required at the primary distribution or collection junction