Answer: -In the larger B&Qs they have a least 3 ranges of pushfit. The quoted life span is up to 50 years. Thats for the Equator range the others are 25-30years -The Hep2O flexible Push Fit Plumbing System has a design life in excess of 50 years when installed in normal domestic central heating or hot and cold water services, and carries a 50 year guarantee against defects in materials or manufacturing. The Hep2O system (previously Acorn) has been manufactured and used for 25 years. Further informtion is at:http://www.hep2o.co.uk The Hepworth Plumbing Products Team