Probably the only valve snorkel on the market that is developed for and suitable for underwater hunting.

Product description from Riffe:

A low profile light weight snorkel with a flexible Vinyl tube, giving divers the ability to fold up or stow in their BC. The dry top is shaped like a shark fin and reduces the catch of line, seaweed and floating material

The RIFFE Stable snorkel comes with a high quality hinged snorkel keeper. It is the easiest clearing snorkel tested in our industry by freedivers. This Amazing snorkel is a true Fresh Air Snorkel.

Give it a try. You will not be disappointed.