AC4000 Adaptor Coupling: 121-136mm to 110-121mm

• Brand: Fernco (formerly Flexseal) / VIP Seal
• Model: AC4000 Flexible Adaptor Coupling
• Size Range: 121-136mm x 110-121mm (suitable for popular 4" drainage pipes)
• Material: EPDM Rubber & 1.4301 (304) Stainless Steel
• Pressure Rating: 0.6bar, 8.70psi
• Jetting Resistance: 180bar
• Temperature Range: -50°c to 80°c constant, 100°c intermittent
• Tightening Torque: 6Nm
• Standards: BS EN 681-1:1996  |  BS EN 295-4:2013  |  BS EN 10088-2:1995

The Fernco AC4000 Flexible Adaptor Coupling, previously branded as Flexseal, is designed to connect drainage pipes with different outside diameters, making it ideal for joining larger pipes to smaller pipes and vice versa. Sometimes referred to as a reducer coupling, this adaptor provides a versatile solution for unadopted drainage systems.

Each adaptor coupling (also referred to as Bandseal coupling) is constructed from three main components: a stepped EPDM rubber body molded with two different diameters to fit pipes of 121-136mm on one side and 110-121mm on the other, plus two stainless steel clamp bands. Once positioned on the pipes, the clamp bands are tightened with a nut driver and torque wrench to create an airtight and watertight seal, securing the connection within seconds.

We have the full range available from Fernco, please contact us for more information.