The propane locker is supposed to have an opening that drains overboard - at least that is the ABYC requirement on newer boats. It is a safety thing to prevent an explosive mixture buildup in the locker if there is a leak. Rhapsody doesn't have a propane locker so I can't speak to what was done on J/30s that were built with the propane locker. I can say that on my J/109 there is a separate drain path at a low point in the locker directly overboard above the waterline. The locker is isolated from the inside of the boat. There are also safety warnings in the J/109 owners manual.
Here are excerpts from the ABYC LPG standard (document attached)
A-1.8.2 Installation:
A-1.8.2.1 LPG lockers shall be installed so that the locker opens only directly to the outside atmosphere, and
A-1.8.2.2 If a LPG locker is installed inside a boat locker, the LPG locker shall be located as high and as close to the boat locker's opening as possible in order to comply with A-1.8.2.1.
A-1.8.3 When means of access to the LPG equipment locker or housing is open, the cylinder valves shall be capable of being conveniently and quickly operated, and the system pressure gauge dials shall be fully visible.
A-1.8.4 Lockers shall be vented at the bottom by a dedicated vent, with a minimum diameter of any component in the vent system that shall be not less than 1/2 inch (12.5 mm) inside diameter.
A-1.8.5 Locker vents shall be led outboard, without pockets, through the hull to a point lower than the locker bottom and above the waterline with the boat in the static floating position.
NOTE: See ABYC H-27, Seacocks, Thru-Hull Connections and Drain Plugs, for requirements for seacocks.
A-1.8.6 Locker vent openings shall be located at least 20 inches (508 mm) from any hull opening to the boat interior.
A-1.8.7 LPG lockers shall not be used for storage of any equipment other than LPG cylinders, cylinder valves, regulating equipment, and LPG safety devices. See A-1.8.1.
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