BS EN ISO 9001 BSI
  BS EN ISO 14001 BSI
  BS 437: 2008 Specification for cast iron drain pipes, fittings and their joints for socketed and socketless systems
  BS 5163: Part 1: 2004 Valves for waterworks purposes. Predominantly key-operated cast iron gate valves. Code of practice
  BS EN 1074: Part 2: 2000 Valves for water supply. Fitness for purpose requirements and appropriate verification tests. Isolating valves
  BS EN 545: 2006 Ductile iron pipes, fittings, accessories and their joints for water pipelines. Requirements and test methods
  BS EN 598: 2007 Ductile iron pipes, fittings, accessories and their joints for sewerage applications. Requirements and test methods
  BS EN 877: 1999 Cast iron pipes and fittings, their joints and accessories for the evacuation of water from buildings. Requirements, test methods and quality assurance