Fernco 33U-305 Pipe Donut – 3" SV Hub x PVC (SCH 40/STD) Compression Seal Gasket

Donuts · Donut Pipe Gasket

Fernco 33U-305 Pipe Donut – 3" SV Hub x PVC (SCH 40/STD) Compression Seal Gasket

Part # 33U-305

Precise, application-specific fit. Engineered to match specific pipe ODs and cast iron hub dimensions for a secure, interference fit that ensures...
Fast, tool-friendly installation. Installs quickly with standard tools, reducing labor time while delivering a consistent, professional connection.
Durable elastomeric construction. Manufactured from high-quality elastomeric material that resists wear and maintains sealing performance over time.
Trusted and preferred. Proudly manufactured in the united states.

Donuts Size: 3" x 3"

Connects Service Weight Cast Iron to SCH 40

Drawing (PDF) All documents

Dimensions

Download drawing (PDF)

End 1 inside diameter	3.49"
Length	4.50 in
Width	11.88 in
Height	2.38 in
Weight	0.35 lb

Product details

The 33U-305 pipe donut connects 3" service weight hubs to sch 40/STD PVC pipe, providing a secure, compression-based seal. Designed for precise fitment, it ensures a leak-resistant connection while simplifying installation compared to grout-based methods. Ideal for residential and commercial DWV systems.

Compression seal technology. Creates a tight, leak-resistant seal by compressing between the pipe and hub—eliminating the need for messy grouts or sealants.

Compatible with multiple materials. Designed for use with cast iron hubs and PVC (sch 40/std) pipe, making it a versatile solution for DWV system connections.

Specs and codes. Complies with ASTM d5926, ASTM c1173 and uniform plumbing code (UPC)