Are these to be setup for actual water?.. When I worked for state department we had tons of Toyota products... and in several African countries yes, these had snorkels. But these earlier snorkels were in NO WAY waterproof.. they were made to avoid dust (main issue I saw this on a daily basis was Sudan). These snorkels had seams in them and if sealed both ends, top and bottom, then submerged,.. they would fill via the seams. We would seal them up with various silicone products or plastic welding (drove a few in moister areas like this - Sierra Leone for one).
Shouldn't be an issue if the newer ones are one piece and all the connections are also water-tight but, I'd have to see one before I waste $$ on one.
Bill