On a glacier bay single hole faucet, there are a hot and cold tube protruding from the bottom of the faucet. One protrudes about 4 inches, the other is about 7 inches out. Which one is for hot water, or, does it matter?

Yes it matters. Normally there will be a tag on the hot side. If no tag present, simply put the on/off handle in the hot position and blow through one tube at a time. The one you can actually blow through will be your hot. You shouldn't be able to blow through the cold tube unless you turn the handle to cold. Pretty easy to figure out. Or you could simply hook it up, and if hot and cold are reversed, swap the supplies. I believe the longer tube is usually the hot, but not sure on GB.

Sure it matters but every one I have ever seen has a tag. If not, look for a red dot, that's hot. Lastly, move the handle to the left and blow into one of the ends. It you can't blow, it is the CW. If you can, it's the hot.

Ha, posted at the same time. Same answers. Great minds...

Ha, posted at the same time. Same answers. Great minds...

And I was posting the same to you!