AC4000 Fernco Adaptor Coupling 121mm - 136mm / 110mm - 121mm

Fernco AC4000 adaptor coupling with a banded seal, designed for pipe with an outside diameter of 121mm to 136mm and 110mm to 121mm. Manufactured from EPDM rubber, incorporating a Grade 1 304 stainless steel band.

The Fernco AC4000 Adaptor Coupling is engineered to deliver a secure and flexible transition between very large drainage pipes of unequal outside diameters. Designed for professional and industrial use, this coupling provides reliable sealing performance where durability and long-term stability are essential.

EPDM Adaptor Coupling Data Sheet

Constructed from high-quality EPDM rubber and fitted with heavy-duty stainless steel clamp bands, the AC4000 creates a robust watertight and airtight seal that resists corrosion, cracking and environmental wear. Its flexible design absorbs minor pipe movement and misalignment, simplifying installation across mixed pipe materials. The straightforward fitting process requires only standard tools, ensuring efficient installation without compromising reliability.

Key Features & Benefits:

• Suitable for very large mixed-diameter pipe connections
• Durable EPDM rubber construction
• Heavy-duty stainless steel clamping bands
• Creates a reliable airtight and watertight seal
• Compensates for minor pipe misalignment
• Fast installation with standard tools
• Compatible with PVC, clay, concrete and cast iron
• Ideal for industrial and infrastructure drainage systems

The AC4000 offers strength and adaptability for demanding large-scale drainage transitions.