Bushing, Spigot x Slip (Flush Style) PVC Schedule 80 10" x 4" (837-624)

The 10" x 4" PVC Schedule 80 Bushing (Spigot x Slip, Flush Style), Part #837-624, is a heavy-wall reducing bushing engineered to adapt a 10-inch slip-socket fitting down to accept a 4-inch pipe or spigot connection. Manufactured from Type I, Grade I PVC compound to ASTM D2467 specifications, this fitting delivers Schedule 80's characteristic higher pressure rating, increased wall thickness, and superior chemical resistance — making it the correct specification for industrial process, chemical handling, and high-demand infrastructure applications where a Schedule 40 bushing would be underspecified.

The spigot x slip configuration defines how this bushing integrates into a system: the spigot (male, plain) end is dimensioned to insert directly into a 10-inch slip socket on an existing fitting or valve, bonded in place with solvent cement; the slip (female, socket) end then receives a 4-inch pipe or spigot fitting, also solvent welded. This allows the bushing to function as an in-socket reducer — eliminating the need for a separate reducer coupling when a fitting with a 10-inch slip socket already exists in the line.

The flush style body design is a critical distinction from hex (flanged) bushings. Rather than protruding beyond the face of the mating socket, the flush bushing sits fully recessed within it — producing a compact, low-profile transition with no external shoulder or flange. This makes it the preferred choice in tight mechanical spaces, valve manifolds, buried installations, and equipment connections where a hex bushing's protruding flange would create clearance issues or impose bending stress at the joint.

At the 10" x 4" size differential, this bushing accommodates a substantial flow reduction in a single fitting — a transition that would otherwise require a fabricated reducer assembly or multiple fittings in series. For systems where an existing 10-inch flanged valve, tee, or coupling already has an open slip socket that needs to transition to a 4-inch branch or instrument tap, Part #837-624 provides a direct, code-compliant, single-piece solution.

Specifications:

Note: At large diameters, pressure ratings for PVC fittings decrease relative to smaller sizes and are further reduced at operating temperatures above 73°F. Consult ASTM D2467 pressure derating curves and your engineering specifications before installation in high-pressure or elevated-temperature service. The 10" x 4" size differential also introduces flow velocity changes at the transition — account for potential turbulence or pressure loss in hydraulic design.

Industries & Applications:

• Industrial Process Piping — In-socket diameter reduction at valves, tees, and equipment connections where an existing 10-inch slip socket must transition to a 4-inch process line, instrument tap, or chemical feed point without adding a separate reducer coupling to the assembly.
• Chemical Handling & Water Treatment — Reducing bushings for chemical dosing headers, treatment plant distribution manifolds, and chemical feed systems where PVC's broad resistance to acids, caustics, and chlorinated media is a primary specification driver.
• Municipal Water Infrastructure — Service connections, meter setters, and branch taps on large-diameter distribution mains where a 10-inch fitting socket must transition to a 4-inch service lateral or appurtenance connection.
• Industrial Valve Manifolds — Adapting large-bore valve bodies with 10-inch slip ports to smaller downstream piping circuits, particularly in systems where valve size is dictated by mainline flow capacity rather than branch circuit sizing.
• Irrigation & Agricultural Systems — Mainline manifold transitions where 10-inch supply headers branch to 4-inch zone or sector feeds at control valve assemblies, filter stations, or pump discharge headers.
• HVAC & Mechanical Systems — Chilled water, condenser water, and process cooling loop connections in large commercial or industrial facilities requiring an in-socket size transition at equipment ports or distribution headers.
• Power Generation & Heavy Industrial — Cooling water, service water, and chemical injection system connections at large-diameter headers in refineries, power plants, and heavy process facilities.
• Aquaculture & Recirculating Systems — Large-diameter manifold-to-branch transitions in high-flow recirculating aquaculture systems (RAS) where tight mechanical spaces make flush-style bushings preferable to hex alternatives.