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you can feel it if it's dual action. My pump is not, the upstroke is easy, down stroke is hard. I've done the flat to not flat pump with it, and it sucks. Just doesn't move the volume of air a car tire needs. It moved up to 15psi fairly well, only took me 15 minutes of constant pumping, but getting to 25psi was another 15 minutes. Glad I had nothing better to do at the time.
In a pinch, they'll do, but don't expect to go anywhere anytime soon..
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