My kit only contains 1 rubber sealing washer. If there were 2 in the set I could put one each under and above the countertop. Unfortunately there was only one, so it doesn't fit very well on the countertop. So it moves a little. This is an outdoor camping sink so I didn't return it as the wobbling didn't bother me too much. If you're worried about water getting under that faucet handle, I would either buy another rubber washer of the same size or a different faucet.
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