Quote:
Originally Posted by Rubikoop
Sounds like you are describing a vented loop anti siphon valve.
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Or at least what should be a vented loop. Often the vent is nothing but a little pee hose plumbed into the
cockpit drain. If its plugged you should really unplug it and fit either a proper anti siphon valve or send a small stream of
water out where you can see it.