Ductile iron stepped coupling 1) stepped coupling are designed for use on air, water, sewer and gas pipelines. 2) The couplings are wide tolerance product and fit all popular standard pipe sizes, thus dramatically reducing the number of product to be stocked for maintenance purposes. 3) The couplings are suitable for steel, PVC, ductile iron, asbestos cement, GRP, cast iron and concrete pipes. Step Couplings are designed and manufactured to fit on pipes of varying nominal bore where the pipes to be connected on either side excludes the use of the Unifit range. 4) Special reducing step couplings and reducing step flange adapters can be manufactured with reducers built into the product allowing a step across many nominal bores such as from DN40mm to DN100mm. Available Range From DN40mm - DN600mm. Material of Construction 1) End Rings - Ductile Iron to BS2789 Grade 420/12, 500/7 2) Sleeves - Ductile Iron to BS2789 Grade 420/12, 500/7 or Steel to SABS 1431 Grade 300WA 3) Coating - Fusion Bonded Epoxy to SABS 1217, minimum thickness 250 microns, colors in RAL5005, RAL5015, RAL3009, RAL9005, RAL9011 or others. 4) Bolts - Steel to BS970 Grade 070M20, Carbon steel Grade 8.8, SS304 or SS316 Bolts available upon requests. Bolt coating Dacromet, or Galvanized Rubber Seal - E. P. D. M. Grade E to BS2494 1990 Type W&D
