Reducer Bushing, Slip x Slip PVC Schedule 40 10" x 6" (437-626)

The 437-626 is a 10" x 6" Schedule 40 PVC reducer bushing with a slip spigot (male slip) on the 10" end and a slip socket on the 6" end. This single-piece fitting accomplishes a four-inch nominal diameter reduction — a mid-range step-down within the 10" Schedule 40 bushing series — by inserting the 10" spigot directly into any compatible 10" slip socket fitting while the 6" socket accepts the downstream pipe or fitting, completing the full transition without an intermediate coupling or additional components between fittings.

The 10" to 6" step-down occupies a distinct and practical position in large-diameter PVC system design. Unlike the modest 10"×8" reduction (437-628), which transitions between two high-capacity primary distribution sizes, the 10"×6" step-down represents a more deliberate reduction in system flow capacity — from a large-volume primary main to a 6" secondary header, zone supply line, or equipment branch that serves a defined portion of the system at meaningfully lower flow demand. This is the reduction fitting that appears at the transition point between a trunk main and a mid-capacity distribution branch: large enough to carry substantial flow, but clearly a secondary circuit rather than a co-equal distribution run.

In large-diameter municipal, irrigation, and industrial distribution systems, this kind of four-inch nominal step-down is a routine part of tiered network architecture. A 10" primary main may branch to multiple 6" zone headers simultaneously through tee and bushing combinations — the 437-626 serving as the compact, single-piece transition at each of those branch points rather than requiring a separate reducing coupling to accomplish the same diameter change. This integration into an existing socket fitting is the bushing format's core advantage: one fitting, one spigot-to-socket joint, no intermediate coupling, and the full transition accomplished within the footprint of the parent fitting's branch outlet.

Both ends use solvent-weld connections. The 10" spigot is machined to IPS outside diameter tolerances for a precise, interference-fit bond in any 10" Schedule 40 slip socket, and the 6" socket accepts standard IPS-dimension Schedule 40 PVC pipe or fittings. At the 10" spigot end, heavy-bodied cement is the correct grade given the socket depth and surface area at large diameter; standard or heavy-bodied cement is appropriate at the 6" socket end. Manufactured from virgin PVC compound to ASTM D2466, the 437-626 carries the white color standard for Schedule 40 fittings and is NSF/ANSI 61 listed for potable water service.

Specifications:

Industries & Applications:

• Municipal Water Distribution — Primary-to-secondary zone header transitions from 10" distribution mains to 6" zone supply lines, service district headers, and lateral feed circuits in tiered municipal water distribution systems; the bushing integrates directly into an existing 10" tee or elbow socket, keeping the transition compact and the joint count low at each branch point throughout the network
• Large-Scale Irrigation & Agriculture — Step-down transitions from 10" irrigation supply mains and pivot system primary feed lines to 6" zone distribution headers, sector supply laterals, and manifold inlets on large agricultural, golf course, and commercial landscape installations where the 10"-to-6" reduction defines the boundary between primary supply and zone distribution tiers
• Industrial Process Piping — Mid-range diameter reductions on 10" process water, cooling water, and plant utility fluid distribution headers transitioning to 6" equipment zone circuits, cooling loops, and secondary distribution branches in manufacturing and heavy industrial facilities
• Pump Station & Equipment Connections — Discharge or suction side diameter transitions where pump flange adapters, valve bodies, or equipment sockets are dimensioned for 6" pipe on a 10" system; the spigot end integrates directly into existing 10" socket hardware without additional transition components, simplifying the pump discharge assembly
• Stormwater & Drainage Management — Gravity-flow conveyance system transitions where a 10" collection or transmission main steps down to a 6" secondary conveyance run, outfall connection, or detention system outlet; smooth PVC interior minimizes turbulence and head loss at the four-inch nominal reduction point
• Water & Wastewater Treatment — Distribution header step-down transitions in treatment plant piping where 10" primary mains connect to 6" secondary distribution circuits, filter feed headers, chemical dosing supply lines, and zone supply assemblies on process water and effluent distribution systems
• Aquaculture & Recirculating Systems — Flow distribution transitions from 10" primary supply headers to 6" zone circuits, aeration feed mains, and return distribution headers in large commercial aquaculture, hatchery, and industrial water treatment facilities where tiered header sizing supports balanced zone flow distribution
• Fire Suppression & Site Utility — Diameter transitions on commercial, industrial, and campus-scale fire protection supply mains and site utility runs where 10" underground supply lines connect to 6" above-ground risers, zone headers, building entry points, or hydrant supply branches
• Chemical Processing & Manufacturing — Corrosion-resistant mid-range inline reductions on large-diameter chemical distribution and process fluid headers where the 437-626's single-piece bushing construction reduces joint count at the 10"-to-6" transition and PVC's chemical resistance handles the media contact requirements of the system