Bushing, Spigot x Slip (Flush Style) PVC Schedule 80 4" x 2" (837-420)

The 837-420 is a 4" x 2" Schedule 80 PVC Flush Style Bushing with a Spigot x Slip configuration. This fitting reduces pipe size across a full two-size step — the spigot (male) end is sized to the OD of 4" PVC pipe, inserting directly into any standard 4" slip socket fitting or valve, while the slip (female) socket on the opposite end accepts 2" PVC pipe for solvent cementing. Both ends are solvent-weld connections, making the complete assembly a fully cemented, permanent, pressure-rated reduction with no threads required.

The "flush style" designation means the shoulder of this bushing sits completely flush within the face of the receiving fitting socket — unlike a hex bushing, which presents a raised hexagonal collar that protrudes beyond the socket face. The flush profile produces a cleaner, more compact assembly that is preferred in close-coupled equipment connections, tight valve box installations, and applications where a protruding hex shoulder would conflict with adjacent fittings, flanges, or structural clearances.

The spigot x slip configuration is designed to nest inside an existing 4" fitting rather than bridging two pipe ends. The spigot inserts into a 4" tee, cross, coupling, valve, or other slip-socket fitting — effectively converting that 4" port to a 2" slip socket in place — without requiring the larger fitting to be replaced or a separate coupling added to the line. This makes the flush bushing the most compact and efficient reducing solution when a 4"-ported fitting is already installed or specified and a 2" continuation or branch connection is required.

The 4" to 2" size step is a significant reduction — more aggressive than a single size step — and is encountered in applications where a large-capacity header, manifold, or valve services a much smaller downstream branch or sub-circuit. Common use cases include pump discharge assemblies where a large valve or manifold body feeds a smaller-diameter distribution line, chemical dosing systems where a 4" header taps into individual 2" feed lines, and irrigation manifolds where a large supply main branches to individual 2" zone laterals. Schedule 80 wall thickness ensures the fitting meets the pressure and chemical resistance demands of industrial and commercial service environments where Schedule 40 would be underspecified.

Specifications:

⚠️ Note: In a reducing fitting, the smaller end governs the pressure rating. The significant size step from 4" to 2" means the spigot end is substantially larger than the slip outlet — confirm the correct part number carefully before ordering, as adjacent SKUs in this series cover different outlet sizes. Ensure the spigot is fully seated to depth in the receiving socket before cementing and hold firmly through the set period.

Industries & Applications:

• Chemical Processing — Converts a 4"-ported valve, manifold, or tee to a 2" branch outlet inline, allowing a large header to feed individual smaller-diameter chemical feed or dosing lines without replacing the primary fitting
• Water & Wastewater Treatment — Used at large header-to-branch transition points where 4" distribution mains step down to 2" sub-circuit or individual equipment feed lines within treatment plant piping systems
• Industrial Process Piping — Reduces fitting and spool piece count on process skids where a 4" valve or manifold socket must be adapted to a 2" process line, keeping the assembly compact within a defined footprint
• Pump Station & Equipment Connections — Inserted into 4" discharge or suction valves and fitting sockets where the downstream pipe or equipment connection is 2", concentrating the size reduction within the existing fitting body rather than adding external reducers
• Irrigation & Agricultural Systems — Transitions large-diameter 4" supply headers to 2" individual zone laterals at manifold branch points, particularly in valve box assemblies where the flush profile maintains clearance that a hex shoulder bushing would compromise
• Municipal & Utility Infrastructure — Applied in valve vaults, meter stations, and confined-space piping assemblies on municipal water systems where a flush-profile 4" to 2" reduction is required to maintain structural and spatial clearances