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These stainless steel caps are vastly superior to the plastic variety. The smooth, continuous threads are very well suited for use with those recycled 2 liter seltzer bottles with flimsy threads. The rubber gaskets ensure a very tight seal that greatly reduces leakage when shaking the bottles by hand. And they can be easily tightened by hand without using a wrench. This is highly recommended from someone with 12 years experience using this technique.
I used it to fill plastic bottles with homemade beer.
The poppet is fussy and leaks pressure if you don't poke at it repeatedly to get it to sit right. I've had this product for a few years.
I ordered 6 of these and they work ok, but I have used others that were much better but cost as much as $16 each. I use them to transport beer samples to accounts for tasting, they allow me to keep appropriate carbonation levels between each stop. I've had others work better and worse than these. The issue is always with the poppet and seal inside, they don't always seat/seal and will leak the gas out (and beer if on its side). Sometimes you can push/pick at it to get it to seal but not before you lose most of the pressure. Just looking at the poppet you can see it's been ground to fit (rather than machined). The one I paid $16 for was much nicer and seals every time, not just 60% of the time. In this case it seems you get what you pay for. I thought I had bought the nicer ones from these guys, but maybe they got a new manufacturer.
Get the stainless, I have both but thinking of buying another one of these and throwing the plastic one in the recycle. There really is no comparison, get the stainless.