Bushing, Spigot x FPT PVC Schedule 40 4" x 1" (438-417)

The 438-417 is a Schedule 40 PVC reducing bushing with a 4-inch spigot (plain end) and a 1-inch female pipe thread (FPT) opening. The spigot end solvent cements directly into any standard 4" Schedule 40 or Schedule 80 PVC socket, while the FPT bore accepts a 1" male-threaded fitting, valve, plug, or instrumentation connection. This pairing is a practical solution wherever a large-diameter pipeline requires a smaller threaded service port, pressure tap, or equipment tie-in without the need for additional inline adapters upstream.

Built from rigid, high-impact PVC compound, the 438-417 is rated for continuous cold-water pressure service and is dimensionally compatible with ASTM D2466 Schedule 40 fittings throughout. The 4" spigot end requires 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" FPT port accepts PVC or metal male-threaded connections; apply PTFE thread tape or an approved pipe thread sealant on all threaded assemblies.

Specifications:

Industries & Applications:

• Municipal & Commercial Plumbing — Reduces a 4" main line socket to a 1" threaded service connection for valves, pressure gauges, or branch takeoffs in commercial plumbing systems.
• Water Treatment & Distribution — Provides a threaded instrument, sample, or chemical injection port on large-diameter PVC pipelines without breaking into the main run.
• Irrigation & Agricultural Systems — Used at pump discharge headers or manifold assemblies where a 4" inlet reduces to a 1" threaded outlet for zone control valves, solenoids, or pressure regulators.
• Industrial Process Piping — Adapts large-diameter PVC process lines to 1" threaded connections for monitoring equipment, bypass ports, or chemical feed points in corrosion-resistant installations.
• Pool & Spa Equipment Rooms — Transitions 4" suction or return headers to 1" threaded ports on auxiliary equipment, sight glasses, or bypass assemblies.
• HVAC & Chilled Water Systems — Connects 4" PVC drainage or secondary piping to 1" threaded drain, vent, or condensate tie-ins on mechanical and air handling equipment.