Old Habits Die Hard And that’s why we teach here at Coral Bay Divers that a valve is either closed or fully open. Have a read and let me know if you have any questions. Old Habits Die Hard You Might Also Like Becoming a PADI Divemaster & PADI Instructor 14/02/2021 8 Things You Should Never Do Immediately After Diving 25/01/2023 Becoming an PADI Open Water Diver at 65 14/02/2021