Adaptor Couplings for Connecting Pipes of Different Sizes

Adaptor Couplings

Fernco Adaptor Couplings, sometimes referred to as reducer couplings, are designed to connect unadopted drainage pipes with different outside diameters – connecting larger drainage pipes to smaller drainage pipes and vice versa.

Provides a quick and efficient method of connecting pipes of different materials and outside diameters
Reliable, tried and tested products
Large variety of sizes for a multitude of pipe configurations

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SKU: adaptor-couplings Category: Flexible Couplings

Introduction to Adaptor Couplings

Adaptor Couplings are made from three component parts: one stepped moulded EPDM rubber body with two different diameters on each side and two stainless steel clamp bands, which when tightened create a secure connection.

These simple yet effective connectors can be tightened onto pipes using a nut driver and torque wrench, creating a permanent airtight and watertight seal in just seconds.

Technical cut section of Adaptor Coupling connection two pipes

Unadopted Drainage Applications

Fernco Adaptor Couplings are the tried and tested method for connecting unadopted or private drainage systems and with a range developed over 30 years, Fernco has an Adaptor Coupling for almost any pipe configuration.

Applications include housing sites, private roads, industrial sites, agriculture land and more.

Adopted Drainage Applications

Adopted drainage systems are most commonly adopted by highway agencies, water companies or local authorities.

The responsibility of maintaining these drainage systems falls with the undertaker and maintenance work is regulated under specifications such as WIS 4-41-01 which states that all adopted drainage sewers must only be connected using Shear Banded Couplings. This is to ensure connections are protected under earth loads.

For this reason, Adaptor Couplings are prohibited on adopted drainage systems. Drainage pipes with differences in outside diameters should be connected using Shear Banded Couplings combined with Bushes.

None conformance with WIS 4-41-01 on adopted pipe lines

Conformance with WIS 4-41-01 on adopted pipe lines

Go to Shear Banded Couplings

Adaptor Solutions for UltraRib Pipe

Connecting onto ribbed pipe can be tricky if using the wrong type of coupling. Clamp bands on Adaptor Couplings cover only one rib and pipe movement/ground settlement can sometimes cause this to fall between the ribs.

Fernco manufacture couplings specifically for UltraRib pipe. The Fernco AR Adaptor Couplings feature an extra wide clamp band on the side connecting the UltraRib pipe. The clamp band is wide enough to cover at least two ribs to ensure a secure fit with added sealing protection. The other side of the AR Adaptor Coupling is designed to connect Clay pipe of the same DN as the connecting UltraRib.