Reducer Bushing, Spigot x FPT PVC Schedule 40 2" x 1-1/2" (438-251)
$1.88
This 2" x 1-1/2" Schedule 40 PVC Reducer Bushing (Spigot x FPT) provides a compact mixed-connection near-full-size transition from a 2" socket fitting hub down to a 1-1/2" female NPT-threaded outlet, consolidating a modest 1.33:1 diameter reduction and a socket-to-thread material transition into a single fitting body — the least aggressive confirmed reduction in the 2" inlet 438 sub-series and driven almost entirely by the need to match a 1-1/2" threaded downstream component rather than by any hydraulic flow management requirement. Constructed in white Schedule 40 PVC, it offers reliable performance in commercial plumbing, irrigation, and light industrial installations where a 1-1/2" male-threaded valve, pump port, filter housing, or high-flow equipment connection must be installed directly at a 2" socket assembly port location without a separate hex bushing, inline reducer coupling, or multi-piece transition assembly.
The 2" spigot (male plain end) is sized to insert directly into the hub of any standard 2" socket-end fitting — tee branch outlet, cross port, coupling end, elbow outlet, or valve body — and is solvent-cemented in place to form a permanent, leak-free joint at the outer face of the hub. The 1-1/2" FPT interior accepts any standard 1-1/2" male NPT-threaded fitting, valve, nipple, pump port, or equipment connection for a pressure-tight mechanical connection when made up with thread sealant or PTFE tape. This Spigot x FPT mixed-connection configuration is the correct choice when the upstream 2" assembly is an all-socket PVC system and the downstream component is a 1-1/2" male-threaded fitting or device — distinct from the 439-251 (2" x 1-1/2" MPT x FPT Hex Bushing, confirmed in this catalog session), which threads into a 2" female-threaded port rather than cementing into a 2" socket hub, and from any 437 series all-slip counterpart at this size (Spigot x Slip, 2" x 1-1/2" if stocked), which provides a 1-1/2" socket outlet for a cemented pipe run rather than a threaded component connection. The 1-1/2" FPT outlet is among the most widely specified threaded connection sizes for zone valves, pump stations, filter housing connections, and high-flow equipment ports in commercial plumbing and irrigation systems — making 438-251 the highest-flow, nearest-full-size confirmed entry in the 2" inlet 438 sub-series and the appropriate choice wherever a large-diameter 2" socket assembly must serve a high-demand 1-1/2" threaded downstream component at tee branches, cross ports, or manifold hub locations without an intermediate transition assembly.
Rated to approximately 280 psi at 73°F (governed by the 2" spigot end), this bushing is suited for standard commercial and light industrial water distribution and irrigation service within its pressure class. NSF/ANSI 61 listing confirms suitability for potable water contact.
Apply solvent cement to the spigot exterior and the interior of the receiving 2" socket hub per ASTM D2564 procedures, inserting fully and holding briefly for initial set. On the 1-1/2" FPT end, use a quality pipe thread sealant or PTFE tape on the male NPT threads of the mating downstream component before engagement. Avoid over-torquing — PVC threads require hand-tight plus one to two turns. Allow adequate cure time on the cemented spigot joint before pressurizing the system, and derate pressure ratings for elevated temperatures per published derating curves.
Specifications:
| Attribute | Detail |
|---|---|
| Part Number | 438-251 |
| Fitting Type | Reducer Bushing |
| Connection Type | Spigot x FPT (Male Plain End × Female Pipe Thread) |
| Size | 2" x 1-1/2" (Spigot Inlet × FPT Outlet) |
| Schedule / Series | Schedule 40 |
| Material | PVC (Polyvinyl Chloride) |
| Color | White |
| Pressure Rating | 280 psi @ 73°F (governed by 2" spigot end; verify against manufacturer tables) |
| ASTM Standard | D2466 (spigot end), D2464 (FPT end) |
| NSF/ANSI | NSF/ANSI 61 Listed (verify listing status) |
| Thread Standard | NPT (National Pipe Taper) — 1-1/2" FPT outlet |
| Joint Method | Solvent Cement — spigot end (ASTM D2564); Thread Sealant — FPT end |
| Temperature Range | Up to 140°F (derate pressure for elevated temps) |
| Bond Type | Permanent at spigot end; Removable at FPT end |
| End Configuration | 2" spigot inlet (into socket hub); 1-1/2" FPT outlet (receives 1-1/2" male NPT component) |
| Reduction Ratio | 1.33:1 nominal (2" to 1-1/2") |
Industries & Applications:
- Irrigation & Water Distribution — Provides 1-1/2" male-threaded high-flow zone valve inlets, pump connection ports, filter housing connections, and large-bore service taps directly at 2" socket tee branches, cross ports, and manifold hubs in agricultural and municipal irrigation systems where high-demand 1-1/2" threaded downstream components must interface with a large-diameter 2" socket mainline assembly without a separate hex bushing or multi-piece adapter transition at the port location
- Commercial Plumbing — Incorporates 1-1/2" male-threaded high-flow branch connections, valve inlets, backflow preventer ports, and equipment feed connections directly at 2" socket fitting hub outlets in commercial building water distribution systems where near-full-size 1-1/2" threaded service components require the highest confirmed branch flow capacity in the 2" inlet 438 sub-series off a large-diameter 2" socket assembly
- Industrial Process Piping — Transitions 2" socket fitting hub branch outlets and manifold ports to 1-1/2" male-threaded pump inlets, valve bodies, flow meters, and high-capacity equipment connections in water treatment, chemical processing, and manufacturing facilities where a near-full-size all-socket-to-threaded transition at 2" socket ports serves high-demand 1-1/2" threaded downstream service components throughout the distribution assembly
- Chemical Handling — Delivers a corrosion-resistant near-full-size mixed-connection socket-to-thread transition at 2" socket fitting hub ports in systems conveying acids, caustics, fertilizer solutions, and other fluids incompatible with metal fittings, where high-flow 1-1/2" male-threaded valve bodies, pump inlets, and chemical distribution components must be connected directly at large-diameter socket assembly ports without metal adapter chains
- Water Treatment & Aquaculture — Used at 2" socket tee branches, cross ports, and manifold hub outlets where high-capacity 1-1/2" male-threaded pump inlets, filter housing connections, and treatment equipment ports must be incorporated directly at large-diameter socket fitting locations with NSF/ANSI 61 compliance required throughout the all-socket assembly
- HVAC & Mechanical Systems — Transitions 2" socket fitting hub ports to 1-1/2" male-threaded pump connections, high-flow valve inlets, and large-capacity service components on cooling tower supply headers, chilled water distribution manifolds, and chemically treated water system socket assemblies within the Schedule 40 pressure class where near-full-size socket-to-thread transitions at 2" ports serve high-demand 1-1/2" threaded downstream components
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Reducer Bushing, Spigot x FPT PVC Schedule 40 2" x 1-1/2" (438-251)
Technical Specifications
This 2" × 1-1/2" SP × FPT Schedule 40 PVC Reducer Bushing is built for dependable performance across a range of plumbing and irrigation systems. It’s made from Schedule 40 PVC, a material chosen for its strength, corrosion resistance, and long service life in real field conditions. Crews who work on residential upgrades, commercial build-outs, and light industrial water systems use this type of fitting because it holds up well under typical working temperatures and low-pressure applications.
Key specs include:
- Nominal Pipe Size: 2" × 1-1/2"
- Material: Schedule 40 PVC
- End Type: Spigot × Female Iron Pipe Thread (FIPT)
- Max Service Temperature: 140°F
- Listings: NSF 14/61 for potable water
- Standards: ASTM D1784
- Part Number: 438-251
- Product Family: Schedule 40 PVC fittings
Specifications help installers match the correct component to their system layout and confirm that the reducer works with standard U.S. pipe sizing, common solvent-weld fittings, and threaded accessories used throughout residential and commercial plumbing.
Typical Applications
A 2” to 1-1/2” PVC Reducer Bushing is used daily in settings where crews need to transition from a larger spigot connection to a smaller threaded connection. This size is common in remodels, service calls, and new system layouts. You’ll often find it in:
- Home and commercial plumbing systems
- Irrigation and sprinkler lines for landscaping
- Pool circulation and spa equipment
- Filtration and water treatment setups
- Agricultural water supply lines
- Low-pressure industrial equipment that uses PVC for chemical and corrosion resistance
Many field technicians also use this bushing when connecting threaded valves, hose bibbs, risers, pressure gauges, or threaded adapters. For example, a 2" manifold feeding a 1-1/2" threaded ball valve is a common setup in irrigation and water distribution. This reducer bushing supports that type of transition without adding bulk or weight.
Installation and Handling Tips
A proper installation starts with clean materials. To begin, wipe the spigot end and the socket fitting to remove dust or moisture. Once the surfaces are ready, apply PVC primer followed by solvent cement. Insert the spigot end fully into the 2" socket fitting and allow the cement to bond according to the recommended cure time on the product label.
For the threaded side, wrap the FIPT end with PTFE thread seal tape. Hand-tighten first, then use tools to secure the joint without forcing the threads; overtightening can shorten the life of the fitting. Stick to temperature and pressure ratings listed for Schedule 40 PVC to maintain long-term reliability.
Why Choose Maxx Supply?
Customers rely on Maxx Supply for a steady stock of Schedule 40 PVC fittings in the most-used sizes. Orders ship quickly, helping contractors reduce downtime and stay on schedule. Every fitting meets recognized NSF and ASTM standards, so buyers can trust the material properties and performance.
Pricing is competitive for both single-piece orders and larger project needs. When customers have questions, our support team is here to help match the right fitting to the job. Consistent service makes Maxx Supply a trusted source for plumbing supplies across residential, commercial, and agricultural markets.
This 2" x 1-1/2" Schedule 40 PVC Reducer Bushing (Spigot x FPT) provides a compact mixed-connection near-full-size transition from a 2" socket fitting hub down to a 1-1/2" female NPT-threaded outlet, consolidating a modest 1.33:1 diameter reduction and a socket-to-thread material transition into a single fitting body — the least aggressive confirmed reduction in the 2" inlet 438 sub-series and driven almost entirely by the need to match a 1-1/2" threaded downstream component rather than by any hydraulic flow management requirement. Constructed in white Schedule 40 PVC, it offers reliable performance in commercial plumbing, irrigation, and light industrial installations where a 1-1/2" male-threaded valve, pump port, filter housing, or high-flow equipment connection must be installed directly at a 2" socket assembly port location without a separate hex bushing, inline reducer coupling, or multi-piece transition assembly.
The 2" spigot (male plain end) is sized to insert directly into the hub of any standard 2" socket-end fitting — tee branch outlet, cross port, coupling end, elbow outlet, or valve body — and is solvent-cemented in place to form a permanent, leak-free joint at the outer face of the hub. The 1-1/2" FPT interior accepts any standard 1-1/2" male NPT-threaded fitting, valve, nipple, pump port, or equipment connection for a pressure-tight mechanical connection when made up with thread sealant or PTFE tape. This Spigot x FPT mixed-connection configuration is the correct choice when the upstream 2" assembly is an all-socket PVC system and the downstream component is a 1-1/2" male-threaded fitting or device — distinct from the 439-251 (2" x 1-1/2" MPT x FPT Hex Bushing, confirmed in this catalog session), which threads into a 2" female-threaded port rather than cementing into a 2" socket hub, and from any 437 series all-slip counterpart at this size (Spigot x Slip, 2" x 1-1/2" if stocked), which provides a 1-1/2" socket outlet for a cemented pipe run rather than a threaded component connection. The 1-1/2" FPT outlet is among the most widely specified threaded connection sizes for zone valves, pump stations, filter housing connections, and high-flow equipment ports in commercial plumbing and irrigation systems — making 438-251 the highest-flow, nearest-full-size confirmed entry in the 2" inlet 438 sub-series and the appropriate choice wherever a large-diameter 2" socket assembly must serve a high-demand 1-1/2" threaded downstream component at tee branches, cross ports, or manifold hub locations without an intermediate transition assembly.
Rated to approximately 280 psi at 73°F (governed by the 2" spigot end), this bushing is suited for standard commercial and light industrial water distribution and irrigation service within its pressure class. NSF/ANSI 61 listing confirms suitability for potable water contact.
Apply solvent cement to the spigot exterior and the interior of the receiving 2" socket hub per ASTM D2564 procedures, inserting fully and holding briefly for initial set. On the 1-1/2" FPT end, use a quality pipe thread sealant or PTFE tape on the male NPT threads of the mating downstream component before engagement. Avoid over-torquing — PVC threads require hand-tight plus one to two turns. Allow adequate cure time on the cemented spigot joint before pressurizing the system, and derate pressure ratings for elevated temperatures per published derating curves.
Specifications:
| Attribute | Detail |
|---|---|
| Part Number | 438-251 |
| Fitting Type | Reducer Bushing |
| Connection Type | Spigot x FPT (Male Plain End × Female Pipe Thread) |
| Size | 2" x 1-1/2" (Spigot Inlet × FPT Outlet) |
| Schedule / Series | Schedule 40 |
| Material | PVC (Polyvinyl Chloride) |
| Color | White |
| Pressure Rating | 280 psi @ 73°F (governed by 2" spigot end; verify against manufacturer tables) |
| ASTM Standard | D2466 (spigot end), D2464 (FPT end) |
| NSF/ANSI | NSF/ANSI 61 Listed (verify listing status) |
| Thread Standard | NPT (National Pipe Taper) — 1-1/2" FPT outlet |
| Joint Method | Solvent Cement — spigot end (ASTM D2564); Thread Sealant — FPT end |
| Temperature Range | Up to 140°F (derate pressure for elevated temps) |
| Bond Type | Permanent at spigot end; Removable at FPT end |
| End Configuration | 2" spigot inlet (into socket hub); 1-1/2" FPT outlet (receives 1-1/2" male NPT component) |
| Reduction Ratio | 1.33:1 nominal (2" to 1-1/2") |
Industries & Applications:
- Irrigation & Water Distribution — Provides 1-1/2" male-threaded high-flow zone valve inlets, pump connection ports, filter housing connections, and large-bore service taps directly at 2" socket tee branches, cross ports, and manifold hubs in agricultural and municipal irrigation systems where high-demand 1-1/2" threaded downstream components must interface with a large-diameter 2" socket mainline assembly without a separate hex bushing or multi-piece adapter transition at the port location
- Commercial Plumbing — Incorporates 1-1/2" male-threaded high-flow branch connections, valve inlets, backflow preventer ports, and equipment feed connections directly at 2" socket fitting hub outlets in commercial building water distribution systems where near-full-size 1-1/2" threaded service components require the highest confirmed branch flow capacity in the 2" inlet 438 sub-series off a large-diameter 2" socket assembly
- Industrial Process Piping — Transitions 2" socket fitting hub branch outlets and manifold ports to 1-1/2" male-threaded pump inlets, valve bodies, flow meters, and high-capacity equipment connections in water treatment, chemical processing, and manufacturing facilities where a near-full-size all-socket-to-threaded transition at 2" socket ports serves high-demand 1-1/2" threaded downstream service components throughout the distribution assembly
- Chemical Handling — Delivers a corrosion-resistant near-full-size mixed-connection socket-to-thread transition at 2" socket fitting hub ports in systems conveying acids, caustics, fertilizer solutions, and other fluids incompatible with metal fittings, where high-flow 1-1/2" male-threaded valve bodies, pump inlets, and chemical distribution components must be connected directly at large-diameter socket assembly ports without metal adapter chains
- Water Treatment & Aquaculture — Used at 2" socket tee branches, cross ports, and manifold hub outlets where high-capacity 1-1/2" male-threaded pump inlets, filter housing connections, and treatment equipment ports must be incorporated directly at large-diameter socket fitting locations with NSF/ANSI 61 compliance required throughout the all-socket assembly
- HVAC & Mechanical Systems — Transitions 2" socket fitting hub ports to 1-1/2" male-threaded pump connections, high-flow valve inlets, and large-capacity service components on cooling tower supply headers, chilled water distribution manifolds, and chemically treated water system socket assemblies within the Schedule 40 pressure class where near-full-size socket-to-thread transitions at 2" ports serve high-demand 1-1/2" threaded downstream components
- Part #:
- 438-251
- Product Family:
- Sch 40 PVC
- Size:
- 2"
