I’ve had a dynavap for the past 4 years and found ways to use it with my bong and wasn’t wild about it. Lately I’ve gotten a bit more into vaping exclusively and not combusting and needed a few dollars more on my order for free shipping and added this. It’s clutch af. Seals on the bong perfectly and it’s durable too. I dropped it my seconds day about 3 ft onto wood floor and it survived. Of course vgoodiez with the fast af shipping(initially said 5 days but was delivered in 2)