They only make filling easier. The adjustability is good and helps because if you have high psi pressure this thing can kind of keep working, but adjusting your arm properly can prevent that. So far I've used it full force and like low pressure and haven't had any issues other than the fact that it's plastic with all plastic being threaded. I suspect the more I've played around with it, the less it will serve. So vote it up and try not to mess with it too much lol I would buy 10 more if I needed them.
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