Bushing, Spigot x Socket PVC Schedule 40 4" x 1/2" (437-415)

The 437-415 is a Schedule 40 PVC reducing bushing with a 4-inch spigot (plain end) and a 1/2-inch socket (slip) outlet. The spigot end solvent cements directly into any standard 4" Schedule 40 or Schedule 80 PVC socket fitting, while the socket outlet accepts the outside diameter of standard 1/2" Schedule 40 or Schedule 80 PVC pipe via solvent cement — producing a fully cemented, permanent transition from a large-diameter pipeline to a minimal-bore solvent-welded branch, instrument line, drain tap, or secondary circuit in a single fitting.

Representing the most aggressive size reduction in the standard 437 series matrix, the 437-415 is the appropriate choice when a 4" system requires a 1/2" cemented branch connection — for pressure sensing lines, air relief taps, chemical injection branches, or small-bore drain ports — and the downstream connection must remain within a fully bonded solvent-welded assembly rather than transitioning to a threaded interface. Where a 1/2" female threaded outlet is needed at the same 4" inlet, the 438-415 (Spigot x FPT, 4" x 1/2") is the corresponding alternative.

For the 4" spigot end, use an IPS-grade, heavy-bodied solvent cement and a medium-bodied PVC primer per ASTM D2564 — for 4" and larger joints, a two-coat application is recommended to ensure full socket penetration and a reliable, leak-free bond. The 1/2" socket outlet follows standard primer-and-cement procedure for small-diameter PVC joints; ensure full insertion to the socket stop and maintain alignment during the cure set period.

Specifications:

Industries & Applications:

• Municipal & Commercial Plumbing — Reduces a 4" cemented main line socket to a 1/2" solvent-cemented port for pressure gauge branches, air relief connections, drain taps, or small-bore service lines in commercial plumbing systems where a fully bonded transition is preferred.
• Water Treatment & Distribution — Provides a cemented minimal-bore branch tap for pressure sensing, sample collection, or chemical dosing lines on large-diameter PVC distribution and treatment system pipelines without introducing threaded joints at the transition point.
• Irrigation & Agricultural Systems — Used at pump discharge headers, filter assemblies, and mainline manifolds where a 4" cemented inlet must reduce to a 1/2" cemented outlet for fertigation injectors, pressure transducers, or small-bore zone supply lines.
• Industrial Process Piping — Adapts large-diameter PVC process lines to 1/2" cemented branch connections for chemical injection feeds, bypass bleed lines, or instrumentation branches in fully solvent-welded corrosion-resistant systems.
• Pool & Spa Plumbing — Transitions 4" suction or return headers to 1/2" cemented branch connections for air relief lines, pressure gauge taps, or auxiliary equipment feeds in high-flow circulation systems where an all-cemented assembly is specified.
• HVAC & Chilled Water Systems — Connects 4" PVC drainage or secondary piping to 1/2" cemented drain, vent, or condensate branch tie-ins on mechanical equipment where threaded joints at small-bore taps are not desired.