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What’s the easiest way/technique for jar pumping? I can’t seem to get a good seal, or create suction fast enough to keep air from coming in. Any advice?

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I use a rubber glove and cut the end (see pictures). Comfortable, easy to use and very cheap.

Bubblecum wrote: ↑Tue Aug 21, 2018 11:39 pm I use a rubber glove and cut the end (see pictures). Comfortable, easy to use and very cheap.

I used to do that exact same thing.
Used two gloves on a STJ.

It also allows you to try jars with different sized opening.

I like acrylic candy jars. They're lighter, don't get cold & won't break.

I like jar pumping too. Before using I warm them up with hot water. Or use it complete with warm water inside