Donuts · Donut Pipe Gasket

Fernco 44U-305 Pipe Donut – 4" Cast Iron Hub x 3" PVC (SCH 40/STD) Compression Seal Gasket

Part # 44U-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: 4" x 3"

Connects Service Weight Cast Iron to SCH 40

Drawing (PDF) All documents

Dimensions

Download drawing (PDF)

End 1 inside diameter	3.50"
Length	5.25 in
Width	11.13 in
Height	2.25 in
Weight	1.11 lb

Product details

The 44U-305 pipe donut is designed for reducing connections from a 4" cast iron hub to 3" PVC pipe. Its compression-fit design provides a tight, leak-resistant seal without the need for adhesives or grout. Built for durability and ease of installation, it is ideal for DWV system transitions in both new and retrofit applications.

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)