Most likely 3/8” ID tubing.
Thanks! I found some 7/16 that I think will do the trick👍
Skip the carboys. Look into. Speidel fermentors. I still have some glass carboys. Use them when my speidel fermentors are. Full. But be carefull with glass. Not so hard to clean but be carefull moving them.
Ha. some of the old regulars in that thread!