Reducer Coupling, Slip x Slip PVC Schedule 40 2" x 1-1/2" (429-251)

Pre-Write Verification — 429-251

• Series: 429 = Schedule 40 PVC Reducer Coupling, Slip x Slip ✅
• Size code 251: User-specified as 2" x 1-1/2" — size code does not follow a self-evident numeric pattern for this combination ⚠️ Flag for verification before publishing — confirm 251 = 2" x 1-1/2" against manufacturer catalog or internal SKU data to rule out alternate size combinations such as 2" x 1-1/4" or 2" x 2"
• No anomalous prefix flags; suffix warrants confirmation as noted above
• Governing end: 2" slip (larger end) carries the lower pressure rating and governs the fitting; 2" Schedule 40 slip rated at approximately 280 psi @ 73°F ⚠️ Flag for verification before publishing — confirm 2" Schedule 40 slip pressure rating against manufacturer published pressure tables before use in customer-facing content
• Reduction ratio note: 2" to 1-1/2" is a modest one-step nominal reduction — a common inline step-down in commercial plumbing, irrigation, and light industrial systems; preserves high flow capacity through the 1-1/2" outlet; application context should reflect a near-full-size inline reduction driven by downstream pipe sizing compatibility rather than significant flow management
• ASTM: D2466 (Schedule 40 PVC socket fittings) — both ends slip, single standard applies
• Solvent cement ends present (both slip); both ends are below the 4" threshold — no large-diameter cement guidance needed
• NSF/ANSI 61 listed
• Color: White (Schedule 40)
• Note: Reducer coupling joins two different-diameter PVC pipe ends inline via solvent-cement bonds — distinct from a same-size coupling (429 series full-size), a bushing (spigot or MPT/FPT style), and a reducing tee; the inline one-piece reducer coupling replaces a same-size coupling plus a separate bushing at the same location ✅
• Schedule 80 counterpart: 829-101 (3/4" x 1/2") was established earlier in this catalog session — the 829 series is the Schedule 80 equivalent for all reducer coupling entries; cross-link from this page where applicable

Meta Title: 2" x 1-1/2" Schedule 40 PVC Reducer Coupling | Slip x Slip | 429-251

Meta Description: Shop the 2" x 1-1/2" Schedule 40 PVC Reducer Coupling (Slip x Slip, 429-251). White, ASTM D2466, NSF/ANSI 61 listed. Rated to 280 psi @ 73°F. Inline one-step pipe size reduction for solvent-cement PVC systems. Bulk pricing for contractors.

Product Description: This 2" x 1-1/2" Schedule 40 PVC Reducer Coupling (Slip x Slip) provides a direct, inline solvent-cement transition between a 2" PVC pipe run and a 1-1/2" PVC pipe run, consolidating a near-full-size diameter reduction into a single compact fitting body without the need for threaded connections, additional bushings, or multi-piece transition assemblies. Constructed in white Schedule 40 PVC, it offers reliable performance in commercial plumbing, irrigation, and light industrial applications where a corrosion-resistant, all socket-to-socket inline diameter reduction is required along a straight pipe run.

The 2" slip socket on the larger end and the 1-1/2" slip socket on the smaller end each accept their respective PVC pipe sizes for permanent solvent-cement bonds, creating a straight-line reducing transition that keeps the assembly compact and eliminates the need for a full-size coupling plus a separate spigot bushing at the same inline location. This inline configuration is the preferred approach when stepping down pipe diameter along a straight run — offering a lower profile and fewer potential leak points than a bushing-in-coupling assembly at the same transition point. Both sockets are sized to accept standard Schedule 40 or Schedule 80 pipe of the corresponding diameter, making this coupling compatible across mixed-schedule systems where the fitting is Schedule 40 and the pipe may be either schedule. The 2" to 1-1/2" step-down is the most common one-step nominal reduction in commercial plumbing and irrigation distribution systems — most frequently encountered where a 2" mainline transitions to a 1-1/2" sub-main, branch header, or equipment feed run at a straight inline reduction point rather than at a fitting body or tee branch.

Rated to 280 psi at 73°F (governed by the 2" inlet end), this coupling is suited for standard commercial and light industrial water distribution and irrigation service within its pressure class. Its PVC composition provides excellent resistance to corrosion, scale, chlorinated water, and a broad range of chemical exposures, making it a reliable long-term alternative to metal reducer couplings in moisture-prone or chemically active environments. NSF/ANSI 61 listing confirms suitability for potable water contact.

Apply solvent cement to both the pipe end and fitting socket on each side per ASTM D2564 procedures, using a primer appropriate for the pipe and fitting schedule. Insert pipe fully into each socket and maintain a quarter-turn during assembly for even cement distribution across the joint surface. Allow adequate cure time before pressurizing the system, and derate pressure ratings for elevated temperatures per published derating curves.

Specifications:

Industries & Applications:

• Irrigation & Water Distribution — Steps down 2" PVC mainline pipe runs to 1-1/2" sub-mains, zone supply headers, and branch distribution lines at inline reduction points in agricultural and municipal irrigation systems where the one-step nominal reduction is required along a straight run without a direction change or branch fitting at the same location
• Commercial Plumbing — Reduces 2" supply mains to 1-1/2" branch supply runs and equipment feed lines at inline transition points in commercial building water distribution systems, providing a compact single-fitting reduction that eliminates a separate full-size coupling and spigot bushing at the same assembly location
• Industrial Process Piping — Provides an inline solvent-cement pipe size transition from 2" process water distribution mains to 1-1/2" equipment feed lines, lateral supply runs, and branch distribution headers in water treatment, chemical processing, and manufacturing facilities where a straight inline reduction is required along the pipe run
• Chemical Handling — Delivers a corrosion-resistant, all solvent-cement inline diameter reduction in systems conveying acids, caustics, fertilizer solutions, and other fluids incompatible with metal fittings, particularly where a 1-1/2" pipe run must continue off a 2" distribution main along a straight run without introducing threaded interfaces or multi-piece transition assemblies at the reduction point
• Water Treatment & Aquaculture — Used at inline pipe size transition points on recirculating system distribution mains, filter feed headers, and tank supply lines where a 2" socket pipe run must step down to a 1-1/2" socket run at a straight transition point with NSF/ANSI 61 compliance required throughout
• HVAC & Mechanical Systems — Reduces 2" PVC pipe runs to 1-1/2" branch supply and equipment feed lines at inline transition points on cooling tower supply headers, chilled water distribution mains, and chemically treated water systems within the Schedule 40 pressure class