I have bought different sizes and they are great for testing car evaporators to muff components and the larger size is great for sealing the gas cap filler neck. also different sizes. I wish I had had them before, the harder plastic caps they make specifically for this purpose never seal properly because they don't fit very well, especially when something as small as a .010" leak causes leak code, these softer silicone caps and plugs don't change anything.
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