Is PVC pipe generally accepted at well pressure tanks? My setup, installed by the previous homeowner, has about 6' of PVC to plumb the tank from the service line coming from the well, to the copper to the house. Every time the well kicks on/off, there is as slight shimmy in this PVC plumbing. Makes me concerned about the pipe eventually fracturing. Just wondering how well PVC holds up and if i should consider having an all metal pipe setup.