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David
I certainly recognized that they did produce J snorkels almost from the beginning - but continued to produce the double J Ping pong ball snorkels as well.
Across the pond in the former colonies the manufactures which were concentrated in LA and 30 miles south in Orange County California were eliminating Ping Pong ball snorkels from the inventory.
I suspect your efforts are recognizing the international and regional differences as required for diving - aka kelp and possible entanglements vs no kelp and no concern with entanglements.
Therefore the continued aggressive marketing of the J snorkel in the UK in an area devoted of possible kelp entanglements.
Sam Miller, 111
It's significant that the snorkels manufactured on a commercial scale in the former USSR came without ball valves or the like, doubtless due to the popularity of spearfishing there in rivers and lakes where there is a much greater likelihood of entanglement with underwater plant life.