I made two different styles of bell's for my siphon to test out. One with two larger notches (1"x1/2") at the bottom, without a snorkel. Then one with four smaller notches (1/2"x1/2"), with a snorkel. Both work!! Amazing, since this was my first try at making bell siphons. I had to silicone the bottom of the cap and the hole on the cap with the snorkel, to make it air tight.