Rev valves?
I didn't like the idea at first because I found them new on ebay, but it just happened the guy with this ebay store lived right down the road from me so I went to pick them up.
They were in a big white box in plain plastic wrappers, he just dug the right amount out of the right box, and sold them dirt cheap.
They have the name and all etched into the side of the tip.
I later bought the same exact set straight from REV, packaged different, same etching on the stem, about 1/3 more on the price.
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