Bought a set of 6 pieces. Only one was needed but as I had extra I decided to replace the seals on 3 other gas cylinders at the same time. Within 1 month all 4 seals started to leak. Upon examination, each lump became soft and "soft" (best I can describe). It looks like the material the gasket was made of was softened by gasoline. Now I have 4 leaking gas bottles instead of 1. I regret breaking 3 old seals. Do not buy!
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