Adaptor Couplings provide a solution to many cases of adaptation. The coupling is a stepped moulded elastomeric sleeve that has different diameters at each end. The sleeve is fitted with two stainless steel clamping bands which provide an efficient method of connecting pipes that have varying outside diameters and also eradicates possible bush requirements. Adaptor Couplings can also be used to connect all traditional and new pipe systems including structural walled plastic pipes. A special range of Adaptor Couplings which incorporate an extra wide clamping band at one end are available for ribbed pipe systems. The clamping band secures against two or more external ribs on the plastic ribbed pipe thereby ensuring a high performance seal is obtained irrespective of the coupling position or movement. Flex-Seal can also supply Adaptor Couplings with nitrile sleeves.