Bushing, Spigot x Slip (Flush Style) PVC Schedule 80 4" x 3/4" (837-416)

The 4" x 3/4" PVC Schedule 80 Flush Style Bushing (Part No. 837-416) is a pressure-rated, gray-body reducer fitting engineered to transition from a 4" fitting socket down to a 3/4" pipe connection in a single compact component. The spigot (male) end inserts directly into the socket of a 4" fitting — such as a tee, coupling, cross, or valve body — and accepts a solvent-cement joint, while the slip (female socket) end receives a 3/4" pipe with solvent cement on the outlet side.

The flush style profile is the defining characteristic that distinguishes this bushing from a hex bushing in the same size combination. Rather than presenting a protruding hex shoulder that extends beyond the fitting face and requires a wrench for installation, the flush bushing presents a smooth, low-profile outer surface that seats cleanly within the receiving fitting's socket without added bulk, mechanical projection, or gripping-surface interference. This geometry is the preferred choice in inline assemblies, congested mechanical spaces, and installations where a clean, tool-free transition is a practical or aesthetic design priority.

At 4" × 3/4", this bushing delivers a substantial three-and-a-quarter-nominal-size step-down — one of the more extreme reductions available in the 4" flush bushing series. This size combination is purposefully specified rather than incidentally encountered. A 4" fitting socket receiving a 3/4" pipe continuation reflects a deliberate system design decision where the fitting socket serves as the structural anchor point within the 4" main assembly, while the actual flow through the outlet is intentionally minimal and precisely sized. Common contexts include pressure gauge ports, chemical injection points, fertilizer injection taps, sensor supply lines, bleed valve connections, and low-flow instrumentation feeds that must be introduced directly off a 4" fitting socket without intermediate reducing hardware between the 4" fitting and the 3/4" pipe.

The 4" × 3/4" flush bushing is particularly practical in assemblies where a standard 4" same-size tee, cross, or coupling is already part of the system design and a low-flow auxiliary port is needed at one of the sockets. Installing the flush bushing directly into the socket converts that port to a 3/4" connection point in a single component — eliminating the alternative of a 4" × 3/4" reducing tee, a stacked multi-bushing assembly, or a downstream reducer chain that would otherwise be required to achieve the same outlet size. This single-component approach keeps the transition compact, reduces joint count, and preserves the clean inline profile characteristic of flush style bushings.

Manufactured from Type I, Grade I PVC compound, this fitting conforms to ASTM D2467 dimensional standards and delivers the increased wall thickness and pressure ratings characteristic of Schedule 80. Compatible with Schedule 80 PVC pipe and solvent cements meeting ASTM D2564.

Specifications:

Industries & Applications:

• Industrial & Chemical Processing — Pressure gauge ports, chemical injection points, bleed connections, and low-flow instrumentation taps installed via flush bushing into 4" tee, cross, coupling, or valve sockets on chemical-resistant pressure systems where a 3/4" auxiliary outlet is required without intermediate reducing hardware
• Municipal Water & Wastewater — Monitoring taps, sampling connections, pressure gauge ports, and small-bore service connections introduced off 4" distribution or collection system fittings where the 3/4" outlet serves a defined low-flow auxiliary function within the main system assembly
• Commercial Plumbing — Auxiliary service ports and instrumentation connections on Schedule 80 commercial systems where a 4" fitting socket must be converted to a 3/4" connection point without requiring a custom reducing tee or downstream adapter assembly
• Chemical Dosing & Water Treatment — Chemical injection inlets, dosing pump supply taps, fertilizer injection connections, and sensor feed lines installed into 4" fitting sockets on treatment system mains where a 3/4" branch serves a defined low-flow chemical or instrumentation function
• Irrigation — Pressure gauge connections, fertilizer injector ports, and controller supply taps introduced off 4" irrigation main fittings where the 3/4" outlet supplies a low-flow auxiliary circuit, instrument, or chemical injection assembly
• Mining & Oil Field — Instrumentation ports, sampling connections, and chemical injection taps on 4" corrosive fluid handling systems requiring a compact, single-component socket-to-3/4"-pipe transition without additional intermediate fittings
• Aquaculture & Water Treatment — Sensor supply lines, chemical dosing inlets, bleed connections, and monitoring taps on 4" recirculating system headers where a 3/4" auxiliary port must be introduced off an existing fitting socket in a compact, single-component assembly