yes a water trap. I have one and have never found a speck of water in it, but good insurance. I also run a 50 foot hose too even though the machine is only 20 feet away. I think Mike, fishingfreak, told me several years ago that a longer length of hose helps regulate the pressure better. Never been a problem for me so I guess it may work. Also draining your tank after every session keeps the tank from rusting away. That is about all I can tell you. some may be true and some may be pure horse hockey
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