Just to mention it, plumbing sucks. Last night I discovered that there was a slow leak on the sprayer for our kitchen's sink - no idea how long it had been there but there was visible damage in the cabinet under the sink. The leak was happening because an o-ring was wearing out on the sprayer attached to the faucet/tap, so after dinner I went to Home Depot to get a new o-ring. While there I picked up a small box of multiple sizes, figuring it might save me a trip some other time.