Apparatus for coupling pressurized water supply to recreational vehicle fresh water fill port

A coupling device for transferring pressurized water from a hose to a gravity-filled tank, comprising:

• a. a connector body having:
• i. a hose-receiving portion with a fitting compatible with a standard garden hose or fresh water hose,
• ii. a tank-connecting portion with a releasable bayonet mount adapted to engage a fill port of the gravity-filled tank,
• iii. a main conduit fluidly connecting the hose-receiving portion to the tank-connecting portion;
• b. a passive overpressure prevention system integrated into the connector body, including:
• i. at least one vent aperture fluidly coupled to the main conduit, the vent apertures configured to open and release water when pressure in the main conduit exceeds a threshold,
• ii. a deflector extending from the connector body adjacent to the vent apertures, the deflector positioned to intercept and redirect water released from the vent apertures;
• and
• c. wherein the vent apertures have a total flow capacity exceeding a maximum flow deliverable by a garden hose attachable to the hose-receiving portion, such that the main conduit remains substantially unpressurized.