Yes. I made a DIY video a few years back on how to make one with a few parts from the plumbing section of the hardware store. It's super cheap to make and works great for scuba diving. When you aren't using the snorkel it hangs like a necklace and won't flop around (even when swimming at over 3 knots).
There are some forum threads on it, and others have run with the idea, even making 3D print files for the junction 'T' to interface to a standard mouthpiece. I know that for the basic snorkel to purge well, it is important to not use too large a tube diameter. Some of the 3D files were designed to incorporate a purge valve. That kind of goes against my original concept, but may make it less sensitive to the diameter. Bottom line is, I haven't used these other designs, and don't know how well they worked.
Thread on my DIY Loop Snorkel:
Very Cool DIY Dual-Tube Snorkel for about $6
Thread on the spin off designs done by others:
Twin Pipe (loop) Snorkel (DIY)
PS - I have since eliminated the 3 snorkel keepers with a plastic bracket that makes this snorkel even better. I could provide a 3D CAD file for this part if someone wants to print or mill one. I cut mine on the 3 axis mill from HDPE.
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