Coupling, Slip PVC Schedule 80 3" x 1-1/4" (829-336)

Blue Monster 76037 1-Step PVC Cement Clear (32OZ)

This 3" x 1-1/4" Schedule 80 PVC Reducer Coupling (Slip x Slip) provides a direct all-socket inline size reduction from a 3" socket pipe run down to a continuing 1-1/4" socket pipe run — consolidating a significant 2.4:1 diameter reduction into a single all-cemented Schedule 80 fitting body without threaded transition hardware, intermediate bushing chains, or multi-piece reduction assemblies at the inline reduction point. Constructed in dark gray Schedule 80 PVC, it is the second confirmed 3" inlet entry in the 829 series in this catalog session and provides a moderately less aggressive reduction than the confirmed 829-335 (3" x 1", 3:1) — stepping down to a 1-1/4" socket continuation that supplies intermediate-capacity secondary distribution headers, service supply runs, and equipment approach lines rather than the small-bore service connections of the 1" outlet entry. Together 829-335 and 829-336 form the confirmed two-entry 3" inlet 829 sub-series, covering the two smallest confirmed outlet sizes at the 3" socket inlet for inline all-socket Schedule 80 size reductions in industrial and municipal PVC systems.

The 3" slip socket inlet accepts 3" Schedule 80 PVC pipe for a permanent solvent-cement bond, anchoring the fitting to the upstream 3" all-socket distribution assembly. The 1-1/4" slip socket outlet accepts 1-1/4" PVC pipe for a permanent solvent-cement bond on the downstream reduced-diameter pipe run, completing the all-socket 2.4:1 size transition in a single cemented fitting body. This Slip x Slip all-socket configuration maintains continuous all-socket cemented Schedule 80 construction throughout the inline size reduction — the correct choice when both the upstream 3" assembly and the downstream 1-1/4" continuation are all-socket cemented Schedule 80 PVC systems. The correct choice between 829-336 (1-1/4" outlet) and the confirmed 829-335 (1" outlet) is determined entirely by the required downstream socket pipe run diameter — 829-336 is the correct fitting when the downstream continuation must proceed as a 1-1/4" socket distribution or service run while 829-335 is correct when the downstream continuation is a 1" socket service or instrument run; both share the same 3" inlet, governing pressure rating, and all-socket construction throughout. At 3" x 1-1/4", this reducer coupling most commonly appears at pump station discharge assemblies where a 3" pump discharge socket run must step down to a 1-1/4" socket secondary distribution or service continuation; at large industrial process water manifold inline transitions where a 3" primary header must supply a 1-1/4" dedicated intermediate-capacity service or secondary distribution run inline; at large agricultural and municipal irrigation system primary-to-secondary supply transitions where a 3" all-socket Schedule 80 supply run reduces inline to a 1-1/4" zone supply continuation; and at chemical handling distribution assemblies where a 3" all-socket chemical supply run must reduce to a 1-1/4" secondary distribution continuation in all-socket Schedule 80 construction.

Rated to approximately 260 psi at 73°F (governed by the 3" slip inlet) — consistent with the confirmed 829-335 at the same governing inlet size — this coupling is suited for standard industrial and commercial pressure service within its pressure class. NSF/ANSI 61 listing confirms suitability for potable water contact.

Apply solvent cement to both the pipe end and fitting socket at each port per ASTM D2564 procedures, using a medium-bodied cement appropriate for 3" nominal socket joints at the inlet end and a standard-body cement appropriate for 1-1/4" joints at the outlet end — follow manufacturer cement body recommendations for each nominal pipe size individually. Insert pipe fully into each socket and maintain a quarter-turn during assembly. Note that the inlet socket (3") and outlet socket (1-1/4") are significantly different diameters — confirm pipe diameters carefully before cementing each joint. Allow adequate cure time before pressurizing, and derate pressure ratings for elevated temperatures per published derating curves.

Specifications:

Industries & Applications:

• Pump Station Assemblies — Industrial & Municipal — Steps down a 3" Schedule 80 all-socket pump discharge run, valve station socket assembly, or bypass line to a continuing 1-1/4" socket intermediate-capacity secondary distribution or service continuation run inline in industrial and municipal pump station installations where the 2.4:1 inline socket size reduction must occur in all-socket Schedule 80 construction at a single fitting without threaded components at the reduction point
• Industrial Process Piping — Reduces a 3" all-socket Schedule 80 process water distribution header or primary supply run to a continuing 1-1/4" socket secondary distribution header, intermediate-capacity service line, or equipment approach run inline in water treatment, chemical processing, and manufacturing facilities where a 2.4:1 inline socket size reduction is required at a specific point in the all-socket Schedule 80 distribution layout
• Large-Scale Irrigation — Agricultural & Municipal — Steps down a 3" all-socket Schedule 80 primary supply or pump discharge socket run to a continuing 1-1/4" socket zone supply header, secondary distribution main, or sector approach run inline in large agricultural and municipal irrigation systems where the 2.4:1 inline socket size reduction must occur in all-socket Schedule 80 construction at a single assembly point in the large-diameter distribution layout
• Chemical Handling — Provides a corrosion-resistant 2.4:1 inline all-socket size reduction in systems conveying acids, caustics, fertilizer solutions, and other chemically aggressive fluids where a 3" Schedule 80 socket supply run must reduce inline to a 1-1/4" socket secondary distribution continuation without any threaded interface in the all-cemented Schedule 80 distribution assembly
• Water Treatment & Aquaculture — Used at inline 3" to 1-1/4" all-socket size reduction points on process water distribution runs, chemical dosing supply headers, and treatment system socket pipe assemblies where NSF/ANSI 61 compliance and all-socket Schedule 80 construction are required at the inline 2.4:1 size reduction point throughout the distribution layout
• Municipal Water Distribution — Reduces a 3" Schedule 80 all-socket transmission or distribution socket run to a continuing 1-1/4" socket dedicated secondary service, meter approach, or intermediate distribution run inline in municipal water distribution systems where the 2.4:1 inline socket size reduction must occur in all-socket Schedule 80 construction without intermediate threaded components at the reduction point