Adaptor / Reducer Couplings | 4"-3" | Fernco

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. 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 socket driver and torque wrench, creating a permanent airtight and watertight seal in just seconds.