Walraven operates three divisions. BIS Fixing Systems for heating systems, sanitary installations, sprinkler pipes, air ducts, cooling systems, cable troughs and much more.BIS Fire Protection Systems for smoke proof and fire resistant sealing of pipe apertures and recessed light fittings, as well as products for the fire retardant fixing of pipes and BIS Sanitary Systems Concealed Pre Wall systems, Alpro inspection hatches and products for sanitary installations.

Wavin Osma Drainage Products are leading UK manufacturers and suppliers of plastic drainage pipes, rainwater goods, drainage channels, gullies and manholes. Manufactured in PVC-U and conform to BS 4514, PVC and Polyethylene [PE] . Wavin Osma also manufacture specialist products such as twin wall pipes, perforated drain pipes, SUDS stormwater drainage, underground drain pipes and larger diameter sewage pipes. Wavin Osma ranges are comprehensive and also include plumbing fittings and sanitaryware fittings. Wavin Osma are construction industry innovators and have many patented products for a wide range of applications including Above and Below Ground Drainage, Plumbing, Rainwater Attenuation and SUDS.

Polypipe Ventilation products are available through five main brands, HR01 Heat recovery ventilation units that can recover more than 92% of a buildings heat. The Domus range of plastic ventilation ducting, wall outlets, duct silencers, flat channel ductiong, round pipe ducts including insulated ducting, flexible hoses and high performance extractor fans. FIREBRAKE Duct Fire Protection. The Base range range of slim-line extractor fans for domestic use and now Silavent ventilation products.

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