90 Degree Elbow, Slip x Slip PVC Schedule 40 4" (406-040)

The 406-040 is a 4-inch Schedule 40 PVC 90-degree elbow with slip (socket) connections on both ends, designed to redirect flow at a right angle in solvent-welded PVC piping systems. At 4 inches, this is one of the most frequently used large-diameter elbows in residential and commercial construction, appearing on drain and sewer mains, irrigation distribution headers, stormwater conveyance systems, and pump discharge piping wherever a 90-degree direction change is required on a Schedule 40 run.

Both socket ends accept standard 4-inch Schedule 40 PVC pipe for solvent weld assembly. The slip socket design creates a joint with strength comparable to the pipe itself when properly primed and cemented — a reliable, permanent connection that requires no threading, mechanical fasteners, or gaskets. The smooth interior bore of the solvent weld elbow minimizes flow restriction through the turn, an important consideration at 4 inches where fitting losses on high-volume gravity or pressurized systems can accumulate meaningfully across multiple direction changes.

At 4-inch diameter, proper solvent cement technique is critical to joint integrity. Heavy-bodied PVC cement should be used, applied generously and quickly to both the pipe end and socket bore using a full-coverage stroke. Pipe should be inserted immediately with a quarter-turn rotation to distribute cement evenly, and held firmly for 30 seconds to prevent pushback while the cement begins to set. Two-person application is strongly recommended at this diameter — one to apply cement, one to seat the pipe — to ensure full socket engagement before the cement flashes. Allow a minimum 24-hour cure before pressurizing the system.

This elbow is manufactured from virgin PVC compound conforming to ASTM D1784 Cell Classification 12454 and dimensioned to ASTM D2466 standards for Schedule 40 PVC socket fittings.

Specifications:

Pressure rating is for water service at 73°F. Derate for elevated temperatures per manufacturer guidelines. Use heavy-bodied PVC solvent cement for all 4-inch socket joints. Two-person application recommended. Allow minimum 24-hour cure before pressurizing.

Industries & Applications:

The 406-040 Schedule 40 90-degree slip elbow is a workhorse fitting across residential, commercial, and light industrial applications wherever a right-angle direction change is required on 4-inch Schedule 40 PVC:

• Drain, Waste & Vent (DWV) Plumbing — Right-angle turns on 4-inch building drain mains, horizontal-to-vertical stack transitions, and under-slab drain routing in residential and commercial construction
• Municipal & Residential Sewer Systems — Direction changes on 4-inch gravity sewer laterals and mainlines where the smooth bore and reliable solvent weld joint support long-term performance in buried service
• Stormwater & Drainage Infrastructure — 90-degree turns on stormwater collection piping, catch basin outlets, and underground detention system conveyance lines where Schedule 40 pressure ratings are sufficient for gravity drainage service
• Irrigation & Agricultural Water Distribution — Right-angle direction changes on 4-inch pressurized irrigation mains, pump discharge headers, and field distribution piping where durable, cost-effective fittings are required across large installation footprints
• Swimming Pool & Aquatic Facility Plumbing — Suction and return main direction changes on commercial pool and aquatic systems where 4-inch PVC is the standard pipe size for high-volume recirculation
• Industrial & Light Process Piping — Low-pressure process water, cooling water, and utility line direction changes where Schedule 40 ratings are appropriate and solvent weld joints provide a maintenance-free permanent connection
• HVAC & Mechanical Systems — Large-bore condensate drain mains and chilled water utility lines where 4-inch PVC is routed through mechanical spaces requiring right-angle turns around structural and equipment obstacles