I have a few older Trane Vav's that need new Plunger Valves. The boxes have spiral pipe on the primary side. I have no way of moving the boxes forward, so I'm going to have to cut the primary ducts.
I'm looking for the best option to reconnect the primary ducts. There are some that were do already and they just used fiberglass flex duct with metal bands. Just doesn't look like the best way of doing it.
Is there such a thing as a band coupling for spiral?