I have some blue plastic caps and another stainless steel cap. All of this required me to tighten it very tightly to maintain the desired gas pressure. These caps are so much better! I screw them in with some force to get a tight fit and they handle 50 psi (3.5 bar) with no problem. The main differences are the exact machine fit and the large inner seal. I bought two packs and now I've just ordered four more. It is great!
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