I decided to see what’s up. They’re total crap. Maybe originally a one way valve meant for some other application – and failed. So some guy from the plant took home boxes of the unsold valves, his kids started playing with them and they inspired this device. It’s a plastic pipe you blow into.
The action of the ball valve allegedly causes vibration waves strong enough to maybe loosen the phlegm and mucus in your lungs as you continue blowing until you stop and start coughing up loogies. Then you’ll be able to breath more fully, maybe.
If you have an interest here is an alert young reporter’s account. Legal disclaimer at the bottom in fine print:
This product is not intended to diagnose, treat, cure, or prevent any disease. Results may vary / may not be typical. Reviews or testimonials may be fictionalized.This information does not constitute medical advice and it should not be relied upon as such. Consult with your doctor before modifying your regular medical regime.
EARL OF TAINT 
No, Hunter……you can’t do crack, you’ll melt the plastic! The Russians had similar device, called a “Sukmeov”.
I was expecting the price to be “only $19.95 + plus shipping and handling”.
BLOmi
(Endorsed exclusively by Mrs. Emhoff)
$35.55 for the Turbo Anal Port is a bargain