There are several approved products that can be used in a potable domestic water pipe system. Copper piping is usually used for most new piping installations 2" in diameter and larger as plastic Wirsbo Aquapex ® piping is only made to 2" diameter. However copper piping is manufactured from ½" to 4" in diameter. There are 2 types of copper approved for use type "L" and type "K" which has a wall thickness approximately 25% thicker than type "L". The BC Plumbing codes states that a third party such as Warnok-Hershey shall certify all copper and Wirsbo Aquapex ® piping. The certification process ensures that all piping is manufactures to a standard as set forth in the in the plumbing code. There are only two manufacturers in North America who produce certified piping. A properly installed copper and/or copper and Wirsbo Aquapex ® piping system should provide 40 to 50 years of trouble free performance. Wirsbo Aquapex ® piping is a plastic cross linked piping system. This system has gained in popularity due to the fact that it is flexible allowing an easier installation particularly in new construction where it can be embedded into concrete in long lengths without joints. The Wirsbo Aquapex ® system has a 25-year limited warranty.