Bushing, Spigot x Slip (Flush Style) PVC Schedule 80 4" x 1" (837-417)

The 4" x 1" PVC Schedule 80 Flush Style Bushing (Part No. 837-417) is a pressure-rated, gray-body reducer fitting engineered to transition from a 4" fitting socket down to a 1" 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 1" 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" × 1", this bushing delivers a three-nominal-size step-down — a substantial reduction that reflects a deliberate flow partitioning decision within the system assembly. Positioned between the smaller-outlet 837-415 (4" × 1/2") and 837-416 (4" × 3/4") and the larger-outlet configurations in the 4" spigot series, the 837-417 occupies a practical middle ground: the 1" outlet carries meaningfully more flow capacity than the 1/2" and 3/4" instrumentation-scale outlets while remaining a clearly secondary connection relative to the 4" main. This makes the 837-417 the appropriate specification where the 4" fitting socket must supply a 1" branch circuit, equipment inlet, or secondary distribution line that requires more than a minimal tap but does not warrant a larger reducing bushing or a dedicated reducing tee.

Common applications for the 4" × 1" flush bushing include secondary supply lines, zone control valve inlets, chemical feed mains, equipment supply connections, and sub-distribution laterals where 1" is the standard pipe size for the connected component or downstream assembly. In these contexts, the flush bushing converts an existing 4" same-size tee, cross, or coupling socket into a 1" connection point in a single component — eliminating the need for a custom 4" × 1" reducing tee, a stacked bushing assembly, or a downstream reducer chain that would otherwise add length, joints, and complexity to the branch outlet.

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 — Secondary supply lines, equipment inlets, and moderate-flow branch connections installed via flush bushing into 4" tee, cross, coupling, or valve sockets on chemical-resistant pressure systems where a 1" outlet provides meaningfully higher flow capacity than instrumentation-scale outlets while remaining a clearly secondary branch off the 4" main
• Municipal Water & Wastewater — Service connections, metering taps, and equipment supply ports introduced off 4" distribution or collection system fittings where the 1" outlet serves a defined secondary flow function within the main system assembly
• Commercial Plumbing — Zone control valve inlets, equipment supply connections, and secondary circuit feeds on Schedule 80 commercial systems where a 4" fitting socket must be converted to a 1" connection point without a custom reducing tee or downstream adapter assembly
• Chemical Dosing & Water Treatment — Chemical feed mains, dosing pump supply connections, and secondary treatment circuit inlets installed into 4" fitting sockets on treatment system mains where 1" is the standard pipe size for the connected dosing or treatment component
• Irrigation — Zone control valve inlets, lateral feed connections, and equipment supply taps introduced off 4" irrigation main fittings where the 1" outlet supplies a secondary zone circuit, control valve assembly, or equipment connection with defined moderate flow requirements
• Mining & Oil Field — Secondary circuit feeds, equipment supply connections, and moderate-flow branch taps on 4" corrosive fluid handling systems requiring a compact, single-component socket-to-1"-pipe transition without intermediate reducing hardware
• Aquaculture & Water Treatment — Secondary supply lines, equipment inlets, and moderate-flow lateral connections on 4" recirculating system headers where a 1" auxiliary branch must be introduced off an existing fitting socket in a compact, single-component assembly