Shower drain through wc outlet

[Yeoman_24]

I have a Lavac wc with manual flush which is of manual bilge pump proportions.
Lavac do a 2 way, 1 1/2” Y valve which allows the same manual pump to drain out the shower tray through the wc outlet hose - picture attached.
The diverter is about £75 which is a bit pricey but not bad compared to an electric shower pump out.
Has anyone done this or observations please?
Thanks.

 

[Catalina36]

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[pvb]

The Jabsco valve is about £60.

 

[mikegunn]

I have a jabsco toilet and i have "T'd" my shower pump outlet into the toilet water inlet, close to theseacock. Originally the shower outlet had been T'd into the basin drain, but that caused water to bubble up into the basin. By T'ing into the toilet inlet the waste shower water goes directly into the sea. It cannot go into the toilet because the vented loop in the inlet pipe presents too much of a pressure head. The course of least resistance for the waste water is out through the seacock. It has worked well and the only cost was a "T" fitting and four pipe clips. No valve was necessary. Might work with a Lavac too?
Mike

 

[neilf39]

So long as the valves in the pump are ok otherwise what's left in the pipe from a loo flush could get into the shower sump before pumping. Start pumping as you switch across just in case.

 

[Catalina36]

So long as the valves in the pump are ok otherwise what's left in the pipe from a loo flush could get into the shower sump before pumping. Start pumping as you switch across just in case.

I started off posting just that at #2 then realised from the diagram that since the pump is sucking on both sources rather than pushing behind either one, cross-contamination seemed not possible.

 

[PetiteFleur]

Slightly off topic, I've used the same Jabsco T valve on my manual bilge pump so I can pump water from the saloon or engine compartment. Usually set to the saloon as the engine space is fairly compartmentalised and anyway I've recently installed an electric bilge pump under the engine.

 

[Dan Tribe]

I have a diverter valve to direct foul water to holding tank or overboard. Sooner or later it will require maintenance, getting clogged with hair,soap, limescale or whatever. Consider how you can get access and how you can control spillage.
In your set up, if / when it gets stuck, you could be pumping poo into the shower sump. [edit, just looked at your diagram again, that's not true, sorry]

 

[lw395]

I used to have a boat where the inlet side of the loo was either the seacock or the hand basin. That meant the loo got rinsed with fresh water and handwash after use, what's not to like? To clean the loo, just chuck a little disinfectant in the basin and pump through.
Loo was a Jabsco.
I think having even a miserly shower and pumping the water out using a Jabsco loo pump would be too slow?

I would rather have another skin fitting than add any complication to the dirty side of the toilet plumbing.

 

[Leighb]

I used to have a boat where the inlet side of the loo was either the seacock or the hand basin. That meant the loo got rinsed with fresh water and handwash after use, what's not to like? To clean the loo, just chuck a little disinfectant in the basin and pump through.
Loo was a Jabsco.
I think having even a miserly shower and pumping the water out using a Jabsco loo pump would be too slow?

I would rather have another skin fitting than add any complication to the dirty side of the toilet plumbing.

We had the identical arrangement on our last boat. It worked very well, we always used to flush the loo with plenty of fresh water before leaving the boat and it did help with the sulphur pong.