Reducer Bushing, Slip x Slip PVC Schedule 40 10" x 4" (437-624)

The 437-624 is a 10" x 4" Schedule 40 PVC reducer bushing with a slip spigot (male slip) on the 10" end and a slip socket on the 4" end. This bushing accomplishes a significant six-inch nominal diameter reduction in a single compact fitting: the 10" spigot inserts directly into any compatible 10" slip socket — a tee, elbow, coupling, valve body, or equipment connection — while the 4" socket accepts the downstream pipe or fitting, completing the transition without an intermediate coupling or separate reducer between components.

The 10" to 4" step-down is a substantial reduction, and its presence in a piping system typically signals one of two things: a primary distribution main branching down to a dedicated service lateral or secondary feed line, or a high-volume header transitioning to a branch circuit at a size appropriate for a specific valve assembly, equipment connection, or zone application. In either case, the bushing format delivers meaningful advantages over a full reducing coupling — shorter overall assembly length, one fewer solvent-weld joint, and direct integration into an existing 10" socket fitting without additional components.

Both ends use solvent-weld connections. The 10" spigot is machined to IPS outside diameter tolerances for a precise fit in any 10" Schedule 40 slip socket, and the 4" socket accepts standard IPS-dimension Schedule 40 PVC pipe or fittings bonded with standard or heavy-bodied PVC solvent cement. At the 10" end, heavy-bodied cement is the recommended grade given the socket depth and coverage area involved. Manufactured from virgin PVC compound to ASTM D2466, the 437-624 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 — Service lateral and secondary branch takeoff transitions from 10" distribution mains to 4" service lines, fire hydrant leads, blow-off assemblies, and zone supply connections; bushing format keeps the transition compact within an existing 10" tee or elbow socket
• Large-Scale Irrigation & Agriculture — Step-down connections from 10" irrigation supply headers and pivot system primary feed lines to 4" zone laterals, valve stations, and filter assemblies on large agricultural, golf course, and commercial landscape installations
• Industrial Process Piping — Large-to-small diameter transitions on process water, cooling water, and plant utility fluid distribution headers where a 4" branch or equipment connection feeds off a 10" primary main
• Pump Station & Equipment Connections — Discharge or suction side diameter transitions where pump outlet flanges, valve bodies, or equipment sockets are dimensioned for 4" pipe on a 10" system; spigot inserts directly into existing 10" socket hardware without additional fittings
• Stormwater & Drainage Management — Gravity-flow conveyance system transitions where a 10" collection main steps down to a 4" outfall, cleanout connection, or secondary drainage run; smooth PVC interior minimizes turbulence and head loss at the reduction point
• Water & Wastewater Treatment — Distribution header step-downs in treatment plant piping where 10" primary mains transition to 4" chemical dosing, sampling, bypass, or monitoring branch circuits
• Aquaculture & Recirculating Systems — Flow distribution transitions from 10" supply headers to 4" zone circuits, aeration feed lines, and return branch connections in large commercial aquaculture and water treatment facilities
• Fire Suppression & Site Utility — Diameter transitions on commercial and campus-scale fire protection supply mains and site utility runs where 10" underground mains connect to 4" above-ground risers, hydrant leads, or equipment-side connections
• Chemical Processing & Manufacturing — Corrosion-resistant large-to-small inline reductions on chemical distribution and process fluid headers where the 437-624's single-piece bushing construction consolidates the transition and reduces joint count compared to multi-piece reducing assemblies