Bushing, Spigot x Slip (Flush Style) PVC Schedule 80 6" x 4" (837-532)

The 6" x 4" PVC Schedule 80 Flush Style Bushing (Part No. 837-532) is a pressure-rated, gray-body reducer fitting engineered to transition from a 6" fitting socket down to a 4" pipe connection in a single compact component. The spigot (male) end inserts directly into the socket of a 6" fitting — such as a tee, coupling, cross, or valve — and accepts a solvent-cement joint, while the slip (female socket) end receives a 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. Rather than presenting a protruding hex shoulder that extends beyond the fitting face, the flush bushing sits cleanly within the receiving fitting's socket without added bulk, mechanical interference, or an exposed gripping surface. This low-profile geometry is preferred in inline assemblies, space-constrained mechanical environments, and any installation where a clean, unobtrusive transition is a design or aesthetic priority.

At 6" × 4", this is a substantial two-nominal-size step-down — among the more significant reductions available in a single flush bushing. This size combination is a common and practical specification in large-diameter PVC systems where a 4" branch, sub-distribution run, or equipment connection must be introduced directly off a 6" fitting without intermediate reducing hardware. Consolidating the full two-size reduction into a single bushing eliminates the need for stacked adapters or a reducing tee with a downstream coupling, keeping the assembly compact and minimizing the joint count and potential leak points in the system.

The 6" × 4" reduction appears frequently at pump discharge headers stepping down to 4" distribution runs, at tee branch outlets transitioning from a 6" main to a 4" lateral, and at valve or equipment connections where a 6" fitting socket must accept a 4" pipe continuation. In each of these contexts, the flush bushing's single-component solution is both a quality and efficiency advantage over multi-piece reducing assemblies.

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 — Inline reductions from 6" fitting sockets to 4" pipe continuations on chemical-resistant pressure systems at pump headers, tee branch outlets, and equipment connection points
• Municipal Water & Wastewater — Size transitions from 6" distribution or collection system fittings to 4" service laterals, metering connections, and treatment equipment interfaces
• Commercial Plumbing — Mechanical room and equipment room size reductions on large-diameter Schedule 80 systems where a 6" fitting socket must accept a 4" pipe without intermediate coupling or adapter assemblies
• Irrigation — Pump station and mainline size reductions at 6" tee branch outlets or valve bodies transitioning to 4" lateral distribution runs on large-scale agricultural and landscape irrigation systems
• Mining & Oil Field — Corrosive fluid handling systems requiring a compact, single-component inline reduction from 6" fitting sockets to 4" pipe on chemical-resistant PVC pressure infrastructure
• Power Generation & Utilities — Cooling water and process fluid systems where a 6" fitting socket must transition to a 4" distribution run or equipment connection at pump discharge headers or system manifold points
• Aquaculture & Water Treatment — Large recirculating system headers and distribution manifolds where a 6" fitting transitions to a 4" lateral supply line serving tanks, filter banks, or aeration equipment