The Harmer SML lightweight cast iron pipework system is dry-jointed and has a proven track record for above-ground drainage. With its comprehensive range of fittings and accessories, SML is
the ideal soil and waste system which can also be used for rainwater installations.

Product Images
Key Points


  • A complete soil and waste pipework system
  • Covers installation from pipework connection to stack to underground sewer connection
  • Also suited to rainwater installations in conjunction with Harmer Roof Outlets
  • Pipes available in standard 3m lengths, in diameters of 50mm to 400mm
  • Choice of ductile or stainless steel couplings
  • CE Mark: European product conformity to harmonised standard BS EN 877 in accordance with Construction Products Regulation 2013
  • Kitemark Certification in accordance with BS EN 877
  • Lightweight, strong and durable
  • Excellent noise attenuation, tested to BS EN 14366: 2004
  • Non-combustible – fire protection collars not necessary
  • High tensile strength
  • Inherent resistance to external accidental damage and vandalism
  • Quick to assemble
  • 100% recyclable
  • Pipes and fittings manufactured in grey iron to DIN 1691  (exceeds BS 1452 Grade 150 ISO 185 Grade 15)
  • Couplings are manufactured in stainless steel and ductile cast iron
  • Pipes exterior have a primer coat, minimum thickness 40 µm
  • Pipes interior have an epoxy coating with a minimum thickness of 120 µm
  • Fittings are coated externally and internally with an epoxy coating, minimum thickness 60 µm
Installation & Fixing


  • Assembled by means of twin screw couplings
  • Secure socketless fixing between pipe and fitting
  • No special installation equipment required
  • Epoxy coatings ensure pipes and fittings need minimal maintenance over lifetime of installation