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Discount Hydraulic Hose has copper tubing and nylon tubing air brake fittings...
https://www.discounthydraulichose.com/Search_Results.html?Search=air%20brake%20tube
My M818 has been fully converted to dual circuit air brakes with s-cam rears and M939-series wedges on the front. Plumbing is mostly DOT push-to connect fittings and NT100 nylon air brake tubing. The existing fittings can be used with NT100 if you use the specific tube sleeves, nuts and inserts...