The city service water line is 1" poly (blue; AWWA C-901). Currently it is connected to old copper with a compression fitting, then that copper is connected ~2ft later to even older galvanized with a failing sweat fitting. I would like to remove the copper and galvanized, and connect the poly directly to new 1" PVC. This section will be buried 18+ inches, then transition to new copper just before ground level, and then to new PEX-a under the crawlspace throughout the house. I have found various options for poly-PVC transition -- generally irrigation or other smaller pipes -- but none that speak directly to a buried main water line.
What is the best way to transition poly to PVC?
- Barb x male thread for poly, secured with 1-2 worm gear clamps, and connected to female thread on PVC? Also use teflon + pipe dope.
- Barb x female thread for poly, secured with clamps, and connected to male thread on PVC?
- Universal transition coupling?
- somehow reuse the existing coupling? Though I haven't seen anywhere that metal compression couplings can/should be used for PVC.
- tap a new copper pipe into the existing coupling, attach a new sweat x female adapter, and attach PVC male here? This is not preferred, because I would like to reduce the number of total transitions. Also I'm having trouble finding 1" copper ferrules locally and hesitate to try and salvage the old ferrule.
- something else I'm not thinking of?