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Thanks again to everyone who has been very helpful to me. When I get up and running and finally knowledgeable, I will return the favors. I also donated yesterday, worth every penny. I am about to buy an all-flo 1/2" air pump since my luck with 12v batteries and corrosives has not been a good one. The whole concept of a gasoline air compressor and indestructible pump is appealing. I plan to use 5/8" hose. The CFM spec for the air driving that pump is 18-20, which will require a beast of a compressor. This assumes I want or can even use 17 GPM of fluid flow. I doubt I will ever use half of the 17 GPM the pump will produce if I had a compressor that big. I ask this: am I wasting money on the 1/2" all-flo with lots of capacity, when I could buy the 3/8"? Am I nuts to want a smaller compressor that maxes out at 12 CFM and won't allow the 1/2" pump to push all 17 GPM? Or do I want the bigger pump and know that 12 CFM on the compressor is fine since I'm using a wand jet with such a small orifice that would never allow such flow anyway? Note: I am a genetic relative of Tim "the toolman" Taylor and I would put a fuel-injected supercharger on that pump if they made one. Gilbo