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2009 Beneteau 31 Holding tank vent

May 10, 2017
Beneteau Oceanis 31 Beaver Lake, Roger, AR.
Can someone either point me to a thread or let me know where the vent tub for the holding tank exits the hull? I assume the holding tank it's self is under the stern berth?
Jan 22, 2008
Beneteau 323 Annapolis MD
first thoughtn is to look from the outside at the hull for a small chrome fitting- usualy a vent for water or holding tank.


Jul 24, 2005
Beneteau 323 Manistee, MI
Holding tank vent exits to a fitting on the starboard side of the hull adjacent to the holding tank just below the deck. Stainless fitting should be easy to see. Mud daubers like to build nests in the vent fitting and plug it up.
Feb 21, 2010
Beneteau 31 St-Lawrence river
DougM is right... the holding tank is in the head compartment. If you open the right side mirror/cupboard you will see the top of the holding tank and the vent tube going to the through hull fitting. By shining a strong light on the side of the tank you will see the level of fill (if there is no other gauge).
Do not leave any fluid in the tank when winterizing: these tanks split rather easily at the bottom with the expected results... been there!
May 10, 2017
Beneteau Oceanis 31 Beaver Lake, Roger, AR.
Thanks guys, I was able to fix this and all is. Good. Appreciate the advice.