The later30-1’s have a holding tank directly behind the toilet, in the 
compartment under the sliding plastic doors. Factory item, looks like it was 
built in, with a Y valve under the sink going to a thru hull, also under the 
sink, and diverting to the holding tank. Pump out fitting is on the deck by the 
port. There is an access port to the tank on the ‘floor’ of the cabinet behind 
the doors.


It may be easier to put a pre-fab tank or a flex tank like Jake says in the 
area you are thinking about by inserting it through the large center opening in 
the vee berth and run the plumbing up forward on the port side. To do a tank 
where mine is would require some creative cabinetry and a custom built tank (it 
tapers to match the side of the boat). 




From: CnC-List [] On Behalf Of Jake 
Brodersen via CnC-List
Sent: Tuesday, October 11, 2016 9:26 PM
Cc: Jake Brodersen <>
Subject: Re: Stus-List V Berth Holding Tank




Nauta makes some good flexible tanks.  I’ve had one in my 35-3 for over 15 
years and no problems or smells.




Jake Brodersen

C&C 35 Mk-III “Midnight Mistress”

Hampton VA




From: CnC-List [] On Behalf Of Collin 
Ferguson via CnC-List
Sent: Tuesday, October 11, 2016 19:49
To: <> 
Cc: Collin Ferguson < <> >
Subject: Stus-List V Berth Holding Tank


Hello, This is my first posting to this list.  I'm used to forums like on the 
Moyer site, so hopefully I'm doing this right.


I have a 1974 C&C 30 MK1.  To my knowledge, it was built without a blackwater 
holding tank for the Head.  At some point over the last 40 years a P.O. put a 5 
gallon Jerry can in a storage compartment in the V Berth and installed a Y 
valve after the macerator.  One side of the Y valve goes overboard the other 
goes to the Jerry can.  


I'd like to install a legitimate holding tank and I think the storage 
compartment on the Port side of the V berth is a good spot.


Here's my question...


The current opening to that storage compartment is very small, just barely fits 
the square 5 gallon jerry can.  Can I make that opening bigger without 
affecting the structural integrity of the boat?  I understand that I'll have to 
make the hatch sturdy so it won't fall through when you sleep in the v berth.  
There is a lot more to do, like install and plumb a pump out deck plate.  But 
the placement of the holding tank, and finding one seems to be the hardest part.


Thanks for your help,




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