HI Collin!

welcome! I would contact Holland marine. This guy is a C&C specialist. http://www.hollandmarine.com/


He carries a holding tank that he claims; "These tanks were used on many Canadian built boats, such as Most C&C Yachts, Northerns, Viking 33, and many other boats"

It ain't cheap but if it works...!
Another option is to get a hold of the catalog from the http://www.ronco-plastics.com/ site and try and pick out one that will work best for your space. Most boat tanks are odd shapes to fit better against the hull and give you as much holding volume as possible. As you study the catalog you'll start to get an idea of a good shape for your anticipated space.

You could actually bring the catalog to the boat, while looking in the space you have and measuring. Get as close as you can with maybe a few options and then, perhaps, build cardboard mock ups ans see which ones fit best...

Its a lot of up front work and research but, it'll get you the right tank. This is not a short term project. these tanks last for many years, MANY years. You can also have them place the inlets, outlets and ports to your specified locations.

Hope this helps some.

Danny

On 10/11/2016 7:49 PM, Collin Ferguson via CnC-List wrote:
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,

Collin


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