Venturi or Spray Injection?

[Fishman]

Originally Posted by WarDog

The air can only escape through the drain port.

Assuming no John Guest fitting? I've been running an EV1000 (c/w 2 John Guest fittings which allows additional air release if desired) on my 375 gallon tank for just over 5 years and quite honestly, have had no issues ... and virtually no maintenance. That said, I'm totally unfamiliar with the EV 180 design.