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Step 3Find/make an appropriate hose fitting
I chose to use 1/4" inside diameter braided PVC hose as my vacuum line. It's flexible and stands up very well to vacuum, and you can buy it by the foot in the plumbing department at Lowe's. I bought three or four feet for about a dollar.
To fit the hose, I wanted a hose barb for 1/4" I.D. tubing. There are many fittings (also in the plumbing department) with a hose barb on one end.
I chose a nylon double-ended hose barb (or "butt splice," for connecting two hoses), and cut off the extra barb with a razor knife. That left me with one barb with a flanged base suitable for gluing down, for about a dollar and a minute's work.
Because of the funny shape of the recess on top of the pump cylinder, I also shaved down two opposite sides of the flange, so that it would fit down in the recess. That took another minute.
To fit the hose, I wanted a hose barb for 1/4" I.D. tubing. There are many fittings (also in the plumbing department) with a hose barb on one end.
I chose a nylon double-ended hose barb (or "butt splice," for connecting two hoses), and cut off the extra barb with a razor knife. That left me with one barb with a flanged base suitable for gluing down, for about a dollar and a minute's work.
Because of the funny shape of the recess on top of the pump cylinder, I also shaved down two opposite sides of the flange, so that it would fit down in the recess. That took another minute.
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