They work exactly as they should. And they fit into my allotted 5/8 socket wrench, which I only use on these caps. I've seen a number of reviews saying "They didn't come with a gasket so they didn't work". I've bought dozens and dozens of these at hardware stores before and they never come with "gaskets" but you can buy these 17/32 inch flat rubber washers (like 10 for $3) that they come with form a seal.
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