I use four air hoses with this pump although it has the ability to run up to eight. Two things impress me: first, it's very quiet, and second, it stays cool. I have other pumps that cost the same but vibrate so much they bounce on the floor if I don't tie them down and generate so much heat I'm afraid they'll burn themselves out at times. I will replace them with these. Definitely gets my seal of approval.
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