chrpai
Contributor
Actually, from the picture, it looks like there's a size mismatch between the regulator body and the mouthpiece. The rubber is either too small or way too thin. The bulge where it cracked shouldn't be there.
I wonder if this is validity to this statement. I know when I installed my new mouthpiece it slid on about half way and seemed ok. I thought about putting the plastic stay tie on right there. But instead I pushed the mouth piece all the way up onto the opening. When I do this the mouth piece seems to be stretched at the lip of the opening. It was so tight that it almost seemed like a stay tie wasn't really needed. However I choose to put it on anyways.
It's at that lip where the bulge is that my mouth pieces have failed.