Abstract: The embodiments shown provide a coupling apparatus and method of use to enable fluid communication between a multi-port mechanical switch and a primary dive regulator. The apparatus includes a grooved portion configured to be releasably attached to a multi-port mechanical switch and a leading edge dimensioned to be releasably secured onto a primary dive regulator. The method includes providing the apparatus with the multi-port mechanical switch and primary dive regulator and compressing or extending onto the first end into the multi-port mechanical switch, and extending a second end onto a primary dive regulator to create a hermetically sealed channel for fluid communication through the apparatus.

Abstract: The breathing port isolation apparatus includes a housing, valve, and actuator to enable a diver to isolate a breathing port of a snorkel or dive regulator using a single mouthpiece. The housing is configured to seat the valve and actuator and releasably engage a mouthpiece and dive regulator, which provides the diver with a continuous flow of air through the mouthpiece without having to transition between multiple regulators or breathing ports. The valve includes a piston and enables linear movement between the first and second port. The actuator enables the diver to depress a push-button and transition the actuator between depressed and extended positions, which correspond to the first and second breathing ports.