Bushing, Spigot x Slip (Flush Style) PVC Schedule 80 1-1/4" x 1" (837-168)

This 1-1/4" × 1" Schedule 80 PVC Flush Bushing provides the shallowest available all-solvent-cement size transition in the 837-series 1-1/4" inlet sub-run — a one-step reduction from a 1-1/4" slip socket position directly to a 1" PVC pipe run in a fully solvent-welded Schedule 80 system. The 1-1/4" spigot end inserts into any standard 1-1/4" female slip socket fitting or coupling for solvent cement joining on the upstream side, while the 1" slip socket on the outlet end accepts standard 1" PVC pipe for solvent cement joining on the downstream side. Both connections are permanent, chemically fused solvent-cemented joints — no threaded interface is introduced at either end of the fitting.

The one-step reduction from 1-1/4" to 1" is the minimal adjacent-size transition in the 1-1/4" inlet sub-run, and the 1" slip socket outlet gives the 837-168 the broadest downstream application reach of the three 837-series bushings at this inlet size. One-inch PVC pipe is among the most prevalent pipe sizes in commercial and industrial Schedule 80 systems — appearing across primary process headers, water distribution mains, equipment supply runs, secondary distribution systems, and instrument supply mains throughout industrial and commercial facilities. Wherever a 1-1/4" slip socket position in a solvent-welded Schedule 80 system must transition to a 1" pipe run downstream, the 837-168 bridges that adjacent-size step at the socket face in a single compact bushing with the 1" downstream pipe cementing directly into the outlet socket.

Within the 837-series 1-1/4" inlet sub-run, the three entries serve three distinct downstream pipe sizes and application contexts. The 837-166 makes a three-step reduction to 1/2" for small-bore branch supply, chemical dosing cemented assemblies, and instrument supply branches. The 837-167 makes a two-step reduction to 3/4" for secondary distribution runs, branch supply connections, and smaller secondary zone pipes. The 837-168 makes the minimal one-step transition to 1" — the most common adjacent pipe size in standard commercial and industrial Schedule 40/80 distribution hierarchies — serving the broadest downstream application population of the three. When the downstream run is 1" PVC pipe cementing into the system, the 837-168 is the direct and most efficient single-fitting solution at the 1-1/4" socket position.

At the 1-1/4" × 1" size combination, three Schedule 80 flush bushing series exist. The 839-168 (MPT × FPT, previously written) is all-threaded, threading into a female-threaded 1-1/4" port upstream. The 838-168 (Spigot × FPT, previously written) cements into the same 1-1/4" socket upstream but presents a 1" FPT outlet for connecting a male-threaded valve, pump body, strainer, flow meter, or equipment component downstream. The 837-168 is the correct selection when both the upstream connection is a slip socket and the downstream connection is a cemented 1" pipe run — when the one-step size reduction occurs entirely within the solvent-welded piping envelope without introducing any threaded interface at the bushing position. If the downstream component presents a male-threaded inlet rather than accepting a cemented pipe end, the 838-168 applies. Stocking both the 837-168 and 838-168 ensures complete coverage of the 1-1/4" × 1" size transition regardless of whether the downstream component is a cemented pipe run or a threaded fitting.

The one-step geometry of the 837-168 produces the smoothest hydraulic transition of the three 837-series 1-1/4"-inlet bushings. The minimal size differential between the 1-1/4" spigot inlet and the 1" outlet socket minimizes the flow velocity change at the bushing body — an advantage in pump suction approach piping, flow-metering branch connections, and flow-sensitive secondary distribution runs where pressure drop minimization and smooth velocity transitions at the size reduction point are design considerations alongside the socket-joining function.

The flush style eliminates the protruding hex shoulder of a standard hex bushing, producing a streamlined, low-profile assembly. The close sizing between the 1-1/4" spigot and the 1" outlet socket makes this one of the most physically compact bushing bodies in the 837-series 1-1/4" inlet sub-run — maintaining a minimal profile at the transition point and preserving clearance in congested piping assemblies where adjacent fittings limit the space available at each socket position.

Manufactured in dark gray Schedule 80 PVC, this bushing delivers the increased wall thickness and mechanical strength required in industrial, chemical, and commercial pressure piping where Schedule 40 ratings are insufficient. PVC's broad chemical resistance covers acids, bases, salts, chlorine, and most common process fluids, providing long service life in corrosive environments where metal bushings would degrade or contaminate the fluid stream. NSF/ANSI 61 listing confirms suitability for potable water contact.

Rated to 630 psi at 73°F (governed by the 1-1/4" spigot end), this fitting handles standard to elevated pressure service across a wide range of fluid handling applications. Two separate solvent-cemented joints must be made at installation — the spigot end into the receiving 1-1/4" socket, and the 1" downstream pipe into the bushing's outlet slip socket. For both joints, clean and dry all mating surfaces before application. Apply purple PVC primer to the spigot exterior and receiving socket interior for the upstream joint; apply primer to the 1" pipe end and the bushing's outlet socket interior for the downstream joint. Apply a uniform coat of Schedule 80 PVC solvent cement to both mating surfaces at each joint before inserting. Hold each joint with a slight quarter-turn twist for 30 seconds and allow full cure time per the cement manufacturer's guidelines before pressurizing. Make the upstream spigot joint first to seat the bushing securely in the receiving socket before making the downstream pipe joint at the 1" outlet. Apply published pressure derating factors for service temperatures above 73°F.

Specifications:

Industries & Applications:

• Industrial Process Piping — Reduces a 1-1/4" slip socket position on a process header, tee branch, or coupling to a 1" solvent-welded pipe run within a fully cemented Schedule 80 PVC system in chemical processing, water treatment, and manufacturing facility piping — the most broadly applicable entry in the 1-1/4" inlet sub-run given the prevalence of 1" pipe as the downstream distribution size in standard commercial and industrial Schedule 80 systems; correct wherever both the upstream socket and the downstream 1" pipe run are cement-joined components and no threaded interface is required at the transition point
• Secondary Header to Primary Branch Transitions — Provides a one-step all-cement transition from a 1-1/4" socket secondary header position to a 1" primary pipe run in Schedule 80 PVC commercial plumbing, mechanical room, and building utility systems — a common size pairing at distribution hierarchy transitions where a 1-1/4" secondary header must feed 1" primary branch or distribution supply runs through a fully cemented system without threading at the transition point
• Pump Suction & Equipment Supply Connections — Delivers the smoothest hydraulic all-cement size reduction from a 1-1/4" slip socket position on a pump suction tee, equipment supply coupling, or secondary distribution fitting to a 1" cemented pipe continuation in fully solvent-welded Schedule 80 systems — the one-step minimal size differential minimizes velocity change and pressure drop at the transition point in flow-sensitive pump suction and equipment supply piping
• Water & Wastewater Treatment — Provides a one-step all-cement size transition from a 1-1/4" socket position to a 1" pipe run on secondary distribution assemblies, process header branch connections, pump suction runs, and equipment feed piping in municipal and industrial water treatment facilities where the fully solvent-welded construction is maintained through the single-step size reduction and the downstream 1" pipe run cements into the bushing outlet socket
• Chemical Handling — Delivers a corrosion-resistant, all-cement one-step size reduction from a 1-1/4" socket position to a 1" cemented pipe run on chemical feed headers, reagent distribution secondary branches, and tank recirculation supply connections in systems handling acids, caustics, and aggressive process fluids where the fully solvent-welded construction eliminates threaded interfaces and potential leak paths at the size transition point
• Irrigation & Agricultural Systems — Reduces a 1-1/4" socket position on a tee, coupling, or cross to a 1" cemented pipe lateral or primary distribution branch in solvent-welded Schedule 80 commercial irrigation, greenhouse, and agricultural water supply systems where the downstream 1" run cements directly into the bushing outlet socket as a continuous part of the fully cemented system layout
• HVAC & Mechanical Systems — Installed at one-step size reduction points on Schedule 80 PVC cooling tower makeup secondary distribution assemblies, treated water branch connections, glycol system primary branches, and chilled water drain piping where a 1-1/4" socket position must transition to a 1" cemented pipe run within a fully solvent-welded mechanical system requiring Schedule 80 pressure performance through the minimal all-cement size reduction fitting