From their facebook profile -

"The Long Valley Bar is located in Winthrop Street in the heart of Cork City. With a long history serving local customers as well as visitors from overseas, you can be sure you'll always get a great pint and a hearty sandwich at the Long Valley!"

Well if you are going gluten free you probably wont get a pint, not of beer anyway but the Long Valley do boast 2 gluten free bottled beer options! Not bad at all and it is a great bar with a long history in Cork, well worth a visit!