Vented Differential?
Not crawling under mine at the moment but your right it is a little vent stack. IIRC they say to drain 8 3/4 differential if it gets submerged (ie used in a boat launch or deep azz puddle) so the vent has no check valve.
Not crawling under mine at the moment but your right it is a little vent stack. IIRC they say to drain 8 3/4 differential if it gets submerged (ie used in a boat launch or deep azz puddle) so the vent has no check valve.