Derwent couplings are unrestrained mechanical couplings, designed to suit a wide range of pipe OD’s and suitable for joining spigot ends of pipe manufactured from grey or ductile cast iron, steel, PVC-U, PVC-M, PVC-O and asbestos cement. The coupling is suitable for use in contact with drinking water and neutral fluids (sewage) to a maximum temperature of 40ºC.
The available size range is DN 100 and DN 150 and the couplings are available in both short and long barrel types. Fasteners can be either Grade 316 stainless steel, coated with a Molybond dry film coating, or galvanized mild steel. Plastic caps are fitted to the end of the bolts to protect the protruding thread beyond the nut.