My big one is like
@K9tpr's but with a short cone at the bottom. Finding the short cone was tough last fall, I ordered 2 pictured like this and got 2 long ones before I found this one. It's already tall and heavy but got really tall with a long cone. My most recent dry hop was 126g and only filled to the bottom of the glass on the sight glass. I'm probably going to sell this one because its just too big and my small one is working out well.
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The small one I think I prefer. I use a dedicated gas manifold rather than relying on remembering to open the valve between when not dry hopping. There's no way the 125g dry hop would have fit, I'd have to break that into 2-3 additions which wouldn't be that big a deal. Its also a little harder to dump hops into this one. Using the 3" funnel and lid like the other in place of the gas manifold wouldn't be a terrible choice.
Nocal has a less expensive 1.5" option too.
The butterfly I had was a non-starter for me. Nothing dropped and the plate tended to compact half the hops in its path. The first ball valve I tried was OK but required tapping with a wrench to make the hops drop completely. This one is a lot nicer which was my main reason for buying it but also turned out to be just a little bigger and hops drop a lot nicer. Unfortunately the only markings resembling a part number is "HT 3N457845" and google doesn't find anything.
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