Has anyone used one these???

Right track, wrong train. Consider drying the air entering the compressor pump. I feed mine with dry compressed air at < 10 PSI. DO NOT pressurize the inlet air you would think that would be helpful, the opposite is true. The motor will not start with pressure on the piston either. I'm not certain if filtering the input through desiccant is effective. My shop air is dry to a minus 150 F dewpoint and filtered to 10 micron. Not everyone has a dental compressed air system to do that. Compressing the air literally squeezes the water out of it. I live in a very wet place. I think drying the input air has merit, but really can't remove much water without compression, unlikely the juice is worth the squeeze attempting to dry the input air supply to the pump. A big molecular sieve type HPA filter is likely the best and most practical method to protect your guns from wet air. If you live in a place where air conditioning is a requirement to live running your pump in an air conditioned space is very helpful to minimize water.
 
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