I looked up the detail of that trap. The exact same principal was used by a few different mfg. to drain the outside compartments without fear of water coming back in. Its simply flattened tube which is opened round for connection. I can see in grey water applications crud can easily build up inside the flattened portion where it can no longer close. Simple solution would be to open up and clean the "bladder", no more gas passage. Not sure if a P trap would fit in some of these tight lockers, probably why this type was chosen.
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