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The old air line is 4mm and ages out and cracks. Was hard to get but now available in colors on Amazon along with 4mm push to connect fittings – which are a lot better than the rinky dink connectors used originally on these old chairs. Tubing and connectors are not terribly expensive. The seat is relatively easy to get off the chair and most lines can be accessed and fixed then without taking the whole chair out. I use shut offs on everything like others do. Mike