Work as expected. The only downside, which is why it's only four stars, is that the plastic piece doesn't fit into the Nukatap spouts. So I worry that when I have it outside in summer, it won't stop really determined small bugs. I will probably sand them down a little so they snug into the faucets better.

I have tried a number of tap plugs, which tend to pop off the tap. These fit inside the tap with a snug. Not an airtight fit, but they keep the end of the taps clean when removed and I often dip them in star san when they are put back.

I like that it keeps the faucets covered (no bugs in my beer!) and also performs a quick scrub with every pour.

Does exactly what it says!