Bushing, Spigot x FPT (Flush Style) PVC Schedule 80 1-1/2" x 1/4" (838-207)

This 1-1/2" × 1/4" Schedule 80 PVC Flush Bushing provides a four-step solvent-cement-to-thread size reduction in a single low-profile fitting, transitioning a 1-1/2" slip socket port directly to a 1/4" female NPT threaded outlet. The 1-1/2" spigot end inserts into any standard 1-1/2" slip socket fitting or coupling for solvent cement joining, while the 1/4" FPT end receives any compatible 1/4" male-threaded component on the reduced side.

The 1/4" FPT outlet is the defining characteristic that sets this bushing apart from all other fittings in the 838-series 1-1/2" inlet sub-run. One-quarter inch NPT is the near-universal standard port size for pressure gauges, gauge cocks, pressure transducers, thermowells, pressure switches, and small-bore instrumentation across industrial, commercial, and process piping systems. This makes the 838-207 a purpose-built solution for introducing a gauge port or instrument tap at any 1-1/2" slip socket position in a Schedule 80 PVC system — a task that would otherwise require a separate full-size tee, a threaded outlet fitting, and one or more reducing adapters to accomplish what the 838-207 handles in a single compact component.

The depth of the reduction — from 1-1/2" down to 1/4" — reflects the scale difference between the primary pipe run and the instrument or gauge connection it serves. Process lines, distribution headers, and pump manifolds commonly run at 1-1/2" or larger while feeding instrumentation ports sized at 1/4" NPT. A single flush bushing that spans this full size range eliminates stacked fittings at the gauge tap location, reducing assembly length, minimizing joint count, and keeping the instrument connection as close to the pipe wall as physically possible.

As with all 838-series fittings, the spigot end distinguishes this fitting from the 839-series threaded flush bushings. The spigot end solvent cements into a slip socket rather than threading into a female port — making this the correct selection wherever the receiving fitting presents a slip socket inlet. This allows a 1/4" threaded instrument port to be introduced directly at any 1-1/2" slip socket location without modifying the upstream piping.

The flush style eliminates the protruding hex shoulder of a standard hex bushing, producing a streamlined assembly that installs cleanly inside the receiving socket. At the small outlet size of 1/4", the compact profile of the flush style is particularly advantageous — keeping the gauge or instrument connection tight to the pipe body where clearance for adjacent components or enclosure panels may be limited.

Manufactured in dark gray Schedule 80 PVC, this bushing delivers the 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 1-1/2" spigot end), this fitting handles standard to elevated pressure service. For the spigot end, clean and dry the spigot exterior and receiving socket interior, apply purple PVC primer to both mating surfaces, then apply a uniform coat of Schedule 80 PVC solvent cement to both surfaces before inserting. Hold firmly for 30 seconds and allow full cure time per the cement manufacturer's guidelines before pressurizing. Apply PTFE tape or compatible thread sealant to all male threads engaging the 1/4" FPT outlet — at 1/4" NPT, two to three wraps of PTFE tape is standard practice. Hand-tighten gauge or instrument connections plus one to two turns only; 1/4" NPT threads are particularly susceptible to over-torque cracking on both the bushing and the instrument body. Apply published pressure derating factors for service temperatures above 73°F.

Specifications:

Industries & Applications:

• Instrumentation & Gauge Ports — Purpose-built for introducing a 1/4" NPT pressure gauge, pressure transducer, thermowell, pressure switch, or gauge cock at a 1-1/2" slip socket position on Schedule 80 PVC process headers, pump manifolds, and distribution mains — the single most common application for this size combination across industrial and commercial PVC piping systems
• Industrial Process Piping — Provides a compact, single-fitting solution for instrument taps and gauge connections on chemical processing headers, water treatment process lines, and manufacturing facility distribution systems where 1/4" NPT instrumentation must interface with 1-1/2" slip-socket PVC piping
• Water & Wastewater Treatment — Installs pressure monitoring points, sampling taps, and chemical dosing instrument connections along 1-1/2" Schedule 80 PVC process headers in municipal and industrial treatment plants — eliminating stacked fittings at instrumentation tap locations
• Chemical Handling — Delivers a corrosion-resistant gauge port or instrument tap on chemical feed lines, reagent distribution headers, and tank recirculation loops where the primary system uses slip socket PVC and instrumentation requires a 1/4" NPT connection point in aggressive fluid service
• Commercial Plumbing & Mechanical Rooms — Provides a 1/4" threaded port for pressure gauge monitoring, test cock access, and drain connections at 1-1/2" slip socket positions on Schedule 80 PVC water distribution piping in mechanical room and building utility systems
• Irrigation & Agricultural Systems — Used at pressure monitoring points, chemical injection instrumentation connections, and filter pressure differential taps where a 1-1/2" slip socket mainline or sub-main position must carry a 1/4" NPT gauge or sensor in commercial irrigation and greenhouse distribution systems
• HVAC & Mechanical Systems — Installed at pressure monitoring stations, temperature sensor ports, and test point connections on PVC cooling tower makeup lines, treated water headers, and condensate systems where a compact, schedule-consistent spigot-to-1/4"-thread transition is required within a slip-socket Schedule 80 piping network