Weekender Head Replacement

[Greenman]

Currently my Hunter 27 head has a direct to over board discharge, no option for holding tank what so ever. It's old, mangy and I don't like it. So....my plan is to replace it (and get rid of a hole in the hull at the same time), but I do not want to get too deep into a rebuild as I would rather get out sailing. Here is my plan, do any of you with experience in the area see any glaring issues with this drawing or the product? I wish to use?
Keeping in mind the current use is 2-3 days away from Marinas, not live a board.

Thanks very much.

Sealand Marine Toilet (965Msd) 5.2 Gal. Binnacle.com

[GordMay]

I believe the holding tank should have a vent ((± 5/8"∅); otherwise looks ok.

[Nimble1]

I recently replaced our old marine head with a Theatford Porta-Potty. We seldom overnight more than 2 or 3 nights and sofar it has worked well. I debated on getting the model with pump-out fittings but we don't usually get into marinas for pumpout. Its not that difficult to take the PP into the house and empty and not messy at all.
About your drawing, how would you pump the PP out through your through-hull or is it just left over from your old system?

[Greenman]

The through Hull for the pump out is left over. I would have to add a 12v pump to do the actual pumping.

This one seems expensive, I think, but it would work.

ITT JABSCO MACERATOR WASTE PUMP Binnacle.com

Now I am wondering if I really nead a pump out option

Anyways here is a new drawing with the pump and vent added.

[FrankZ]

Greenman,

Not sure if you are set on the model 965 but you might want to consider the 970 series. Seems silly to talk about but I was much happier with it than the older style 965. They really improved on the design.