A: I have not seen a 5 gallon version of the 1 gallon can lip spout. There is, however, a spout that screws onto the opening in the lid of a 5 gallon paint bucket. See if this meets your needs... https://www.homedepot.com/p/Anvil-5-gal-Pouring-Spout-GPS5-ANV/309996586
A: Empty 5 gallon buckets are under paint supplies. If that's your question?
A: No. For a 1 gallon.
A: Yes. This product is flexible and will conform to the lid of the standard paint can. And, they are so cheap that you can buy one and try it out and make sure it works for you.
A: Yes, I bought mine a couple of months ago and was a bit skeptical if it would really work or not but it was awesome!! It's so nice to have less mess when painting!
A: it fit my 1 gallon Behr cans I just bought. Its a tight fit to snap it on but it works.
A: Yes, it will fit as long as the cans are Quart size cans and not Pint size.