Suspension is better than rubber feet. Just run a few lengths of package string/twine in loops from something in your cage and make a ghetto cradle. If that doesn't work, try some packing foam ... the swiss cheese looking open cell foam, not styrofoam ... like what your motherboard was lying on in its box. Wrap your pump up in that loosely and throw it back in your case. Viola, noise is reduced for $1 at Mail Boxes Etc.
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