Need small 12vdc pressure pump / blower / fan

Need small 12vdc pressure pump / blower / fan
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Hi guys, I'm looking to get a portable 12 volt DC air pump to run a piece of testing equipment I have. The testing equipment needs at least .5 psi or more, with at least .5 CFM, smooth, constant air flow. I'm currently using an air tank, with a regulator, but I'm tired of hauling that bulky tank around everywhere. Also, sometimes I forget to fill the air tank. I have been looking at portable, battery backup fish tank and pond pumps, but they pulse real bad. I want something smoother than those air pumps, so I don't have to make a baffle or chamber to smooth the air out. I've looked into muffin fans for enclosures, but I can't seem to find one that can produce these pressures and volume on 12vdc.
Again, I would like to run this on some type of battery pack. It would need to run for around one hour of tests on one or two batteries.
Any ideas???
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You would probably need something to smooth out piston pulses. Attached free hand sketch. All parts should be available at a local hardware store.

An Auto parts store will have small noisy 12v air compressors. Get a suitable AGM motorcycle battery while you are there.

For the inlet use a metal Schrader valve from an old motorcycle tube.

Dave
I will not give you the answer to your question, but I **will** guide you into discovering how to solve this yourself.

Thanks for the idea. I'm still looking for a few different ideas before I decide on the pump assembly. I would like this to be fairly quite and small, but I might not have any choice on those features.