With this connector you can expand the possibilities of your breath control play because you can regulate the air supply. Use one outlet to let in fresh air, and use the other to sniff your favorite scent. Which one that is: is up to your imagination.
Breath control play is a lot of fun, especially in combination with bondage. But safety first: solo breath play is a known killer in the kink scene. NEVER play alone. NEVER leave your partner unattended, not even for a minute.