|Mission Standard Couplings, which comply with the requirements of WIS 4-41-01, are primarily designed for jointing pipes in sewerage, drainage and other non-pressure applications. Size range : 120mm - 135mm Due to their robust design they have the ability to provide a reliable seal on any pipe material whether rough e.g. concrete or smooth e.g. PVCu. Whilst the centre shear band provides resistance against heavy earth loads and shear forces, helping to ensure pipe alignment with joint flexibility.