Multi Fittings - 3" X 4" X 4" PVC Sewer Offset Downspout Adapter

The Multi Fittings 3" x 4" x 4" PVC Sewer Offset Downspout Adapter is a versatile solvent weld fitting designed to transition rectangular downspouts into round SDR35 sewer pipe systems. Constructed from crush-resistant and chemically resilient PVC, this adapter offers long-lasting performance in underground drainage and stormwater applications. Solvent welding creates a durable, leak-proof joint that eliminates infiltration and exfiltration, ensuring reliable flow control and protecting surrounding soil from erosion or contamination. With an offset design, this adapter provides added flexibility in tight installation areas or where vertical alignment is challenging.

Key Features:

• 3" x 4" rectangular downspout inlet transitions to 4" SDR35 round pipe
• Offset design accommodates tighter or non-linear pipe alignments
• Solvent weld SPGT outlet ensures a permanent leak-proof seal
• Made from corrosion- and crush-resistant SDR35 PVC
• Ideal for stormwater collection and redirection from roof drainage systems

Technical Specifications:

• Connection Size: 3" x 4" inlet to 4" round outlet
• Connection Type: Spigot (SPGT) outlet for solvent weld
• Material: SDR35 PVC
• Application: Stormwater/sewer transitions from downspouts
• Compliance: IAPMO File 2431 (3" & 4")​:contentReference[oaicite:2]{index=2}

Installation & Application:

• Used in underground stormwater drainage tied to roof gutter downspouts
• Solvent weld connection with primer and PVC cement required
• Recommended where offset flow routing is needed

Compatibility & Optional Accessories:

• Fits standard 4" SDR35 sewer pipe systems
• Compatible with Multi Fittings bends, tees, and couplings

Use the Multi Fittings 3" x 4" x 4" Offset Downspout Adapter to transition from rooftop runoff into sewer systems seamlessly. Built for strength and leak protection, it delivers superior performance in residential and municipal storm drainage systems.