$15 electric vacuum pump for anyone!
Was reading in another post about how a Rena air pump could *easily* be converted to a vacuum pump by simply rotating a piece inside the case. Thing is they cost upwards of $40… I purchased a $10 Whisper40 air pump ($15 with s/h) thinking I could convert it to vacuum then re-sell it for a profit. It turns out that converting the new whisper air pumps to vacuum is just as easy just take a look.
6 - completed vacuum pump
7 - pump with cover removed
8 - diaphram and valve (when used as a compressor)
9 - diaphram and valve (when used as a vacuum)
It draws a vacuum of 5” HG in under 2 seconds. I bet a Whisper10 would work quite well although the price difference between a 10 and 40 is not huge so I would go with the 40 which is the largest Whisper pump (with 1 air port and of this type of pump).
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