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they've got a .02-.03" chamfer on the end, they're practically square ended. Unless they're perfectly aligned to the hop rubber, they don't seal very well.
Normal air nozzles have much larger chamfers on the end so even if they're misaligned, they'll still find the center of the rubber and seal.
The G&P nozzles are good, but it's too finicky.
Oh and if it's brand new, you should make sure the gears are shimmed properly before you game with it, otherwise you might break a shaft.
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