Bushing, MPT x FPT (Flush Style) PVC Schedule 80 3/4" x 1/2" (839-101)

This 3/4" x 1/2" Schedule 80 PVC Flush Bushing (MPT x FPT) provides a compact, inline solution for reducing a 3/4" female-threaded port down to a 1/2" male-threaded connection in pressure piping systems. Constructed in dark gray Schedule 80 PVC, it delivers the elevated wall thickness and pressure capacity required in industrial, chemical, and commercial plumbing installations where standard Schedule 40 fittings are insufficient.

The flush style design eliminates the protruding hex shoulder found on standard hex bushings, creating a low-profile, streamlined transition that installs cleanly inside existing female-threaded fittings without adding unnecessary bulk to the assembly. The 3/4" MPT exterior threads into any standard 3/4" FPT or FIP female-threaded fitting, valve, or equipment port, while the 1/2" FPT interior accepts any standard 1/2" male NPT-threaded fitting, nipple, gauge, or instrument connection. Both ends are cut to NPT tapered thread standards for a reliable, pressure-tight mechanical seal when made up with thread sealant or PTFE tape.

Rated to 850 psi at 73°F (governed by the 3/4" MPT end), this bushing is well-suited for demanding pressure service across a wide range of fluid handling applications. Its PVC composition provides excellent resistance to acids, bases, salts, and chlorinated water, making it a durable long-term choice in corrosive environments where metal fittings would degrade. NSF/ANSI 61 listing confirms suitability for potable water contact.

Install using a quality pipe thread sealant or PTFE tape on all threaded joints. Avoid over-torquing — PVC threads require hand-tight plus one to two turns; excessive force can crack the fitting. Derate pressure ratings for elevated temperatures per published derating curves.

Specifications:

Industries & Applications:

• Industrial Process Piping — Reduces 3/4" threaded ports on pump bodies, valve assemblies, and equipment inlets to 1/2" threaded connections for instrumentation, gauges, and small-diameter branch lines in chemical processing, water treatment, and manufacturing facilities
• Commercial Plumbing — Adapts 3/4" female-threaded ports on manifolds, valve bodies, and fixture supply assemblies to 1/2" male-threaded branch connections in high-pressure or exposed pressurized water systems
• Irrigation & Water Distribution — Provides a compact, corrosion-resistant thread reducer at 3/4" valve ports and filter housings transitioning to 1/2" lateral supply lines in agricultural and municipal irrigation systems
• Chemical Handling — Performs reliably in systems conveying acids, caustics, fertilizer solutions, and other corrosive fluids incompatible with metal fittings, particularly where a low-profile bushing preserves spatial clearances in tight assemblies
• Water Treatment & Aquaculture — Used at filter housing ports, pump connections, and treatment equipment assemblies requiring a compact 3/4"-to-1/2" threaded reduction with NSF/ANSI 61 compliance
• HVAC & Mechanical Systems — Reduces 3/4" threaded connections on cooling towers, chilled water loops, and chemically treated water systems to 1/2" ports for sensors, gauges, and drain valves requiring Schedule 80 pressure ratings