Threaded Reducer Bushing, MPT x FPT PVC Schedule 40 1-1/4" x 3/4" (439-167)

This 1-1/4" x 3/4" Schedule 40 PVC Hex Bushing (MPT x FPT) provides a compact, inline solution for reducing a 1-1/4" female-threaded port down to a 3/4" male-threaded connection in commercial and light industrial PVC piping systems. Constructed in white Schedule 40 PVC with a hexagonal shoulder for wrench engagement during installation, it delivers the corrosion resistance and chemical compatibility required across a wide range of fluid handling applications where a 1-1/4" female-threaded port must be reduced to accept a 3/4" male-threaded fitting, nipple, valve, pump port, or equipment connection without additional transition hardware.

The 1-1/4" MPT exterior threads directly into any standard 1-1/4" FPT or FIP female-threaded fitting, valve body, tee branch outlet, or manifold connection, while the 3/4" FPT interior accepts any standard 3/4" male NPT-threaded pipe end, nipple, or fitting for a pressure-tight mechanical connection when made up with thread sealant or PTFE tape. The hexagonal shoulder between the two threaded ends provides a wrench flat for controlled make-up torque — ensuring proper thread engagement at the 1-1/4" exterior diameter. This MPT x FPT hex bushing is the all-threaded approach to inline size reduction at this combination and is the correct choice when both the upstream 1-1/4" female port and the downstream 3/4" male component are threaded, eliminating the need for a socket fitting, separate adapter, or additional threaded nipple at the reduction point. The 1-1/4" to 3/4" step-down is a 1.67:1 moderate reduction to one of the most widely specified branch and service connection sizes in commercial plumbing, irrigation, and light industrial systems — most commonly encountered where 3/4" threaded zone valves, solenoid inlets, filter connections, or service line components are specified at a 1-1/4" female-threaded port, requiring a compact single-fitting all-threaded reduction without a multi-piece transition assembly.

Rated to 370 psi at 73°F (governed by the 1-1/4" MPT end), this bushing 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 hex bushings in moisture-prone or chemically active environments. NSF/ANSI 61 listing confirms suitability for potable water contact.

Install using a quality pipe thread sealant or PTFE tape on both the 1-1/4" MPT threads and the 3/4" male NPT threads of the mating downstream component before engagement. Use the hex shoulder with an appropriately sized wrench to achieve proper make-up torque on the 1-1/4" MPT end. Avoid over-torquing — PVC threads require hand-tight plus one to two turns beyond wrench-tight; excessive force can crack the fitting body or damage the receiving female threads. Derate pressure ratings for elevated temperatures per published derating curves.

Specifications:

Industries & Applications:

• Irrigation & Water Distribution — Reduces 1-1/4" female-threaded tee branch ports, valve body outlets, filter housing connections, and manifold ports to 3/4" male-threaded zone control valves, solenoid valve inlets, and full-service branch fittings in agricultural and municipal irrigation systems where 3/4" threaded downstream components must interface with 1-1/4" female-threaded ports in a compact single-fitting all-threaded reduction
• Industrial Process Piping — Reduces 1-1/4" female-threaded ports on pump bodies, valve assemblies, tee branch outlets, and equipment inlets to 3/4" threaded connections in water treatment, chemical processing, and manufacturing facilities where an all-threaded moderate reduction at a 1-1/4" female port must interface with a widely specified 3/4" threaded service or distribution component
• Commercial Plumbing — Adapts 1-1/4" female-threaded ports on valves, manifold bodies, tee branches, and distribution assemblies to 3/4" male-threaded branch connections, nipple stubs, and service line inlets in commercial building water supply systems where all-threaded PVC construction is specified and the downstream component is a 3/4" threaded fitting or equipment port
• Chemical Handling — Provides a corrosion-resistant all-threaded moderate inline reduction in systems conveying acids, caustics, fertilizer solutions, and other fluids incompatible with metal hex bushings, at 1-1/4" valve body outlets, tee branch ports, and chemical distribution manifold connections where the downstream 3/4" threaded component must be installed without an intermediate socket transition
• Water Treatment & Aquaculture — Used at filter housing ports, pump connection assemblies, tee branch outlets, and treatment equipment interfaces where a 1-1/4" female-threaded port must be reduced to a 3/4" male-threaded component in a compact all-threaded fitting body with NSF/ANSI 61 compliance required throughout the system
• HVAC & Mechanical Systems — Reduces 1-1/4" female-threaded ports on cooling tower pump assemblies, chilled water distribution valve bodies, tee branch connections, and chemically treated water system equipment interfaces to 3/4" male-threaded service connections within the Schedule 40 pressure rating class