If you read the directions, your suppose to trim the tabs back so they dont protrude past your back teeth. I originally bought one for my short hose that I wouldnt normally donate. When we s drill now, it consists of pulling out the tucked longhose and holding the reg up or out to see that its above all other hoses. We dont actually breathe off one anothers reg since that part to me is a no brainer. I did the full s drill procedure the first year or so of diving breathing off each others but unless someone wants to I skip that part these days. It would be rare to need to airshare in sidemount diving thirds but anythings possible.

