If you are trapped in a burning building, toxic smoke inhalation poses the most immediate threat. So, an inventor thought that sticking a tube down the toilet would be a good place to find fresh air.
When is the last time you said: "Gee, that toilet probably has some pretty nice-smelling air inside it." Or: "Gee, I wonder what it would taste like if I breathed the air from inside the toilet pipes." Or: "Gee, the toilet is the only place I can find fresh air in this bathroom filled with smoke."
What about the sink? What about the bathtub? What about getting the heck out of the bathroom filled with smoke before you need to resort to finding the toilet snorkel, unpacking it, reading the instructions, sticking sewer air into your lungs, and burning to death while you're sucking on toilet juices.
Hmm...toxic sewer air or toxic smoky air? I'll take the smoke. It's more sanitary.
I just don't get the Toilet Snorkel. Can you help me translate?