Check out a blog from Mark Conte
The blog starts out…”It seems like water supply piping in manufactured housing is constantly changing. From polybutylene in the old days, to CPVC, and now PEX. One thing that has also changed is the requirement for water supply line pressure testing as a part of installation.If you are like me, you question the need to test water piping in the field (especially in single section homes). Didn’t the manufacturer test the piping before the home left the factory?”….read more on his blog and if interested sign up to receive these timely blogs as they are produced.