Reducer Bushing, Spigot x Slip PVC Schedule 40 6" x 4" (437-532)

The 437-532 is a PVC Schedule 40 reducer bushing with a 6" spigot (male plain end) inlet and a 4" slip (socket) outlet, designed to reduce a 6" socket fitting or pipe hub down to a 4" solvent-welded pipe connection within a single compact fitting. The 6" spigot inlet inserts directly into any standard 6" Schedule 40 socket fitting or pipe hub and is joined with solvent cement and primer per ASTM D2564, while the 4" slip outlet accepts a standard 4" PVC pipe end joined the same way — creating a fully solvent-welded, permanent, pressure-rated reducing transition with no threaded connections at either end.

Manufactured from rigid PVC compound conforming to ASTM D1784 cell classification requirements, this bushing delivers the corrosion resistance, chemical compatibility, and long service life associated with Schedule 40 PVC across a wide range of commercial, industrial, and municipal piping systems. The Schedule 40 wall thickness provides reliable pressure-rated performance for both pressurized distribution systems and gravity-flow applications, and the all-PVC construction resists corrosion, biological growth, and a broad range of chemical media throughout its service life.

The 437-532 performs one of the most practical and frequently encountered reductions in the 6" spigot x slip bushing series — a two-inch step down from 6" to 4". Unlike the near-full-diameter matching of the 437-534 (6" x 5") or the aggressive small-service reductions of the 437-524 through 437-526 siblings, the 6" to 4" reduction occupies the high-flow primary branch zone of the series: both pipe sizes carry substantial flow volumes, and the transition represents a genuine capacity step-down from a large-diameter mainline to a high-capacity distribution or branch pipe. This makes the 437-532 well suited for pump discharge assemblies, distribution manifold branch connections, irrigation mainline laterals, and fire suppression system tie-ins where a 6" system component or fitting must transition to a 4" primary distribution line — a size combination that appears with high regularity in large commercial, municipal, and industrial installations where 6" and 4" pipe frequently coexist in the same system. The spigot x slip configuration produces two permanent solvent-welded joints, making this bushing the correct choice for fixed installations where the reduction point will not require future disassembly and where the compact single-fitting form factor is preferred over a reducing coupling or multi-fitting assembly at the transition point.

Specifications:

Industries & Applications:

• Irrigation & Agriculture — Reducing 6" mainline socket fittings and distribution manifold ports to 4" primary lateral supply lines in large-scale pressurized irrigation systems where the branch carries high flow volumes to major zone circuits or sector headers
• Municipal Water & Wastewater — Reducing 6" socket connections to 4" primary service branches and distribution mains at pump stations, treatment facility headers, and water distribution system assemblies where high-flow capacity must be maintained through the transition
• Fire Suppression — Connecting 6" riser fittings, cross-main socket connections, and system supply components to 4" branch mains and distribution headers in large fire suppression systems where both pipe sizes carry the high flow volumes required for fire suppression demand
• Industrial Process Piping — Single-fitting two-inch diameter reductions in chemical distribution, cooling water, and process fluid systems where a 6" socket fitting or manifold port must transition to a 4" primary distribution line without intermediate fittings or flow restriction at the reduction point
• Commercial Plumbing — Large-diameter distribution system tie-ins in mechanical rooms and commercial buildings where 6" supply headers must reduce to 4" primary distribution mains serving major building circuits or equipment feeds
• Aquaculture & Water Treatment — High-flow reductions from 6" socket manifold connections to 4" primary supply and distribution pipe runs in large recirculating aquaculture and water treatment systems where maintaining high flow capacity through the transition is a core design requirement