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I've put together a few different drain fittings, and usually seen nylon tapered washers that seal the slip joint. But this time, when I bought a sink tailpiece extension, it came with a square-cut rubber washer instead. After installing it, the connection leaks very slowly. What is the intended use of the rubber vs nylon washers? This is the exact piece that I bought, which included the rubber: Form-N-Fit 1-1/4 in. PVC Flexible Tailpiece Extension

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I would think they are both compression fittings. If it is leaking, it is either too tight or not tight enough. Given that it's rubber, I'm expecting not tight enough. As far as the materials, I would expect the nylon to be tapered as it is more rigid than the rubber which when compressed would expand differently than the rigid nylon. –  SpectralGhost Jun 11 at 17:54

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In my experience the flat rubber washer is used only where the tailpiece attaches to the strainer. The tapered nylon washers are used when connecting slip together sections of pipe.

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