I have a 2009 250 Sundancer. My...

[DDIII]

I have a 2009 250 Sundancer.  My holding tank on my head is leaking at the seams, it was pumped to pressurize it but not flushed right away.  If I had to guess the seals? are blown out maybe?  Looking for any advise on how to fix?  Hoping I don't have to completely replace the head.

[wingless]

My guess is that the tank is not pressurized.

It is either a Vacuflush w/ a vacuum generator, or a Vacuflush VHT system that maintains a vacuum on the entire holding tank. Which system is on the boat?

The holding tank is a seamless part, w/ sealed openings at the fittings.

Has the tank been pumped out to be empty? Does the head flush properly? Where are the leaks?

[DDIII]

Honestly not sure which system is on the boat, rarely use it. I know it's a Vacuflush, that's about it. It's empty except for the blue holding tank treatment. It leaks around the seams, especially from the front near the handle to flush.

[wingless]

It sounds like the concern is a fresh water leak at the flush mechanism at the head, not the holding tank.

There is a split clam shell shroud covering the flush valve. Remove the shroud to expose the valve.

There is a garden hose fitting at the valve fresh water supply. Try tightening that fitting coupling to see if the leak is resolved. If not, then a valve rebuild kit will correct the leak. The head has a model number decal that is required to ID the correct replacement parts.

[DDIII]

I've attached a pic, you can see the blue treatment leaking from I think are the seams of the holding tank.

[wingless]

Is there a model number for that head?

Is the head and holding tank all part of that one assembly?

[DDIII]

I couldn't find a model number for the head. Yes, it is all one assembly as far as I can tell.

[wingless]

That looks like a Dometic 970 Series Portable Toilet.

Here are some links. The last one is the manual.

https://stingysailor.com/2015/10/17/product-review-dometic-970-series-portable-toilet-2/

https://www.dometic.com/en/se/products/hygiene-and-sanitation/sanitation/toilets/dometic-972-_-25288

https://cdn.dometic.com/assets/97/16/970-toilets-o-16s-01_39716.pdf?att=true

[wingless]

This document has a blow up parts diagram, price list and parts list.

http://www.southerncalmarine.com/products/sanitation/sealand-vacuflush-systems/sealand-replacement-parts/sealand-replacement-parts.pdf