I have a section, about 18" long, of a thin, black, flexible rubber tubing that I assumed was some kind of automotive vacuum hose. I use this for tripping my packard shutters. I would like to get a few more feet of this. A trip to our local auto parts store yielded a similar hose but one that is about 3-4 times to thick, which causes it to be a lot less flexible. I prefer a rubber hose to a thin plastic hose. Any sources out there?
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