
I bought these to install in the drains on our van sinks. The stock RV plugs/drain siphons were too tight to clean easily and/or stopped the water when you didn't want it to. The way to keep your gray water tank free of bad odors is to keep solid food debris out of the drain. The different sizes of these dyes were also a PLUS. Now they are in both kitchen sinks and the bathroom sink in our RV. A HUGE improvement over the standard RV sink. I keep good old corks handy when I want to fill the sink with water. Great buy and they were on sale! Even better!

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