Profile: Flex-Seal Couplings Ltd designs and manufactures low & non pressure flexible couplings. Standard couplings are specifically designed to connect and repair pipelines of different materials or sizes used in sewerage, drainage and other underground applications. It provides a reliable seal on rough pipe surfaces such as concrete, and a high performance seal on smooth surfaces. Storm drain provides a complete and long term solution for the collection and dispersal of surface water and can withstand vehicles of up to 5 tonne in weight. This channel drainage system is available in 1m lengths and can be combined with a range of accessories that provide connections to sub surface drainage.