Having a filter in your fill nipple is great, it will keep various particles out of your regulator and will help prolong the life of the seals. While the filter in this product probably works well, the included dust cap is pretty terrible. It is threaded and fits rather snugly, which is good, except for the fact that its outer surface is completely smooth. If you get a little paint residue on your hands, you may have trouble removing it. It also seals very well against dust and debris, maybe too well, because if the fill nipple develops a slight leak (like mine did), pressure will build up inside the cap and it will become stuck.
WARNING! If you cannot remove the cap with your fingers, don't try to unscrew it with a pair of pliers like some idiot (I tried)! It will fly off with a bang and could possibly put out your eye.
Throw the cap in the garbage and put on an aftermarket one.
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