Coupling, Slip PVC Schedule 80 3" x 1-1/2" (829-337)

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

This 3" x 1-1/2" 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 1-1/2" socket pipe run — consolidating a meaningful 2:1 diameter reduction into a single all-cemented Schedule 80 fitting body without the need for a bushing chain, multiple intermediate reducer couplings, or threaded transition hardware at the inline reduction point. Constructed in dark gray Schedule 80 PVC, it delivers the elevated pressure performance and chemical resistance of Schedule 80 construction at a moderate large-to-smaller inline socket size transition, suited for industrial pump station assemblies, large process water distribution systems, large-scale irrigation infrastructure, and commercial chemical handling systems where a 3" all-socket Schedule 80 pipe run must step down to a continuing 1-1/2" socket secondary distribution, service approach, or bypass line run inline.

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 1-1/2" slip socket outlet accepts 1-1/2" PVC pipe for a permanent solvent-cement bond on the downstream reduced-diameter pipe run, completing the all-socket 2:1 size transition in a single cemented fitting body. This Slip x Slip all-socket configuration is the correct choice when both the upstream 3" assembly and the downstream 1-1/2" continuation are all-socket cemented Schedule 80 PVC construction — the fundamental distinction from any threaded reducer or bushing that would introduce a threaded interface at the reduction point. The 2:1 reduction from 3" to 1-1/2" is the more moderate of the two confirmed 3" inlet 829 sub-series entries — compared to the more aggressive 829-335 (3" x 1", 3:1), the 1-1/2" downstream outlet serves a broader range of secondary distribution and service approach applications; the correct choice between 829-337 and 829-335 is determined entirely by the required downstream socket pipe run diameter (1-1/2" → 829-337; 1" → 829-335). The 1-1/2" slip outlet of 829-337 is widely specified for pump bypass lines, secondary distribution headers, chemical feed secondary runs, and equipment approach pipe sections that serve meaningful flow volumes off a 3" primary Schedule 80 socket distribution assembly. At this 2:1 reduction, 829-337 is the likely higher-demand entry in the 3" inlet 829 sub-series — the 1-1/2" socket continuation serves a broader application range than the more specialized 1" outlet of 829-335.

Rated to approximately 260 psi at 73°F (governed by the 3" slip inlet), this coupling is suited for standard industrial and commercial pressure service within its Schedule 80 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 1-1/2" joints at the outlet end — follow manufacturer cement body recommendations for each nominal pipe size. Insert pipe fully into each socket and maintain a quarter-turn during assembly for even cement distribution. Note that the inlet socket (3") and outlet socket (1-1/2") are substantially different diameters — confirm pipe diameters before cementing each joint to avoid inserting the incorrect pipe size into either port. Allow adequate cure time before pressurizing the system, 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, bypass line, or valve station distribution socket section to a continuing 1-1/2" socket secondary service line, bypass approach, or zone distribution header inline in industrial and municipal pump station installations where a moderate 2:1 inline socket size reduction must occur in all-socket Schedule 80 construction at a single compact fitting body without threaded components at the reduction point
• Industrial Process Piping — Reduces a 3" all-socket Schedule 80 process water primary distribution header or primary supply run to a continuing 1-1/2" socket secondary distribution run, equipment feed approach, or dedicated service line inline in water treatment, chemical processing, and manufacturing facilities where a 2:1 inline socket size reduction is required at a specific point in the all-socket Schedule 80 distribution layout
• Large-Scale Irrigation — Agricultural & Municipal — Reduces a 3" all-socket Schedule 80 primary supply or pump discharge socket run to a continuing 1-1/2" socket secondary zone supply header, sector distribution line, or service approach run inline in large agricultural and municipal irrigation systems where the moderate 2:1 inline socket size reduction must occur in all-socket Schedule 80 construction at a specific assembly point in the primary distribution layout
• Chemical Handling — Provides a corrosion-resistant moderate 2:1 inline all-socket size reduction in systems conveying acids, caustics, fertilizer solutions, and other chemically aggressive fluids where a 3" Schedule 80 socket primary supply run must reduce inline to a 1-1/2" socket secondary distribution or service continuation without any threaded interface in the all-cemented Schedule 80 assembly
• Water Treatment & Aquaculture — Used at inline 3" to 1-1/2" all-socket size reduction points on process water primary distribution runs, chemical dosing primary supply headers, and treatment system major socket pipe assemblies where NSF/ANSI 61 compliance and all-socket Schedule 80 construction are required at the moderate inline size reduction point throughout the distribution layout
• Municipal Water Distribution — Steps down a 3" Schedule 80 all-socket transmission or primary distribution socket run to a continuing 1-1/2" socket secondary distribution or dedicated service line run inline in municipal water distribution systems where the 2:1 inline socket reduction must occur in all-socket Schedule 80 construction at a specific assembly point without intermediate threaded components