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4. After pulling the hose outside the tray, you can start the repair procedure. First, you need to locate the defect that is causing the leak. Here, you can see that this pinhole in the air line was the culprit. In order to make a clean cut, we used a Craftsman Handi-Cut razor cutter because it will produce a crisp cut without crushing or leaving any frayed edges.
6. There are a variety of inline hose repair unions available at most industrial supply houses or truck parts stores. We selected an inline brass union (DOT rated) that uses ferrules and wrench flats for easy tightening. Notice the inner tube is steel, which is required for DOT air line use. Most brass fittings at home repair centers are not DOT rated, so make sure you get the proper part.

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