If you retained the sales slip for your faucet the manufacturer will likely replace the sprayer for free. Call their tech support group to get your options.

I'm aware of that, thanks.

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• But say you You decide to rid yourself of it. Where do you then shop for a cap, to block off the part which leads to the sprayer? From Moen? From Delta? From a supply house? What key words to search for it online?

Cut the line and pinch it off with locking pliers.

It might depend on what faucet you have, but here's one set of instructions that might work:

Cap Kitchen Sprayer

My experience with Moen and Delta is that you have a lifetime warranty, and it was honored when I sent a photo of the product to show I had it; I did not need a sales receipt to get a free replacement. This would certainly be easier than trying to cap of the leaking sprayer (which might not even be possible, depending on the faucet design). Alternatively, buy and install a new faucet: a decent one is not that expensive. I bought my Hansgrohe kitchen faucet at Costco for $150 and it has been trouble-free.

Is this just a hypothetical question? Since you are asking about several brands, it seems like this isn't a specific situation.

If it's hypothetical, it's a weird thing to be pondering. :)

Thanks all - a few of you gave ideas (and URL) though i think the ideas & URL were based on the pipe being metal.

greg, it was hypothetical prior to my finally coming to a decision (Moen), and then i found out from Moen that indeed the sprayer connection is plastic, but warrantied, and actually includes a sprayer-plug.

Thanks again!

ISSUE RESOLVED.