Sink/loo 2-way changeover valve? Source please?

[Wing Mark]

Apparently, some boats have a change-over valve, so you can either pump seawater through the loo as normal, or pump the sink contents through, so it's easy to put some fresh water and disinfectant through.
Anybody know where to get such a valve?
I guess ideally it will mount inside a locker under the sink and have a know or lever outside the locker?

 

[Mistroma]

You shouldn't need anything expensive. I put a T-piece in the basin drain hose and another T-piece in the head inlet hose. There's a simple ball valve connecting the T-pieces with short lengths of hose. I inserted the T-pieces well above the water line .

The valve doesn't need to be very expensive as it won't be electrically connected to anything and is well above the waterline. Obviously fit decent quality if you can get it.

I simply turn off both sea cocks (basin drain & toilet flush inlet), open connecting valve, run water into the basin and pump the toilet to flush with fresh water. It only takes seconds to switch all three valves back to their normal position. A Y-valve (diverter) would cut out the T-pieces and make it more idiot proof for more money. However, nothing much happens if you turn any of the valves randomly. Either toilet won't flush, basin won't drain or flushing simply suck air. Nothing dangerous and you really, really have to be trying to get it wrong as long as the T-pieces are above the waterline.

I used to get some odour but this cured it completely. I only fresh water flush every 6-8 weeks when living on the boat during summer. I imagine I'd give it a quick flush before leaving if only sailing at weekends. It is also simple enough to add something to the water in the basin to kill an existing problem more rapidly.

 

[prv]

If your question is simply “where to buy valves”, ASAP Supplies is a decent answer.

Pete

 

[Wing Mark]

You shouldn't need anything expensive. I put a T-piece in the basin drain hose and another T-piece in the head inlet hose. There's a simple ball valve connecting the T-pieces with short lengths of hose. I inserted the T-pieces well above the water line .

The valve doesn't need to be very expensive as it won't be electrically connected to anything and is well above the waterline. Obviously fit decent quality if you can get it.

I simply turn off both sea cocks (basin drain & toilet flush inlet), open connecting valve, run water into the basin and pump the toilet to flush with fresh water. It only takes seconds to switch all three valves back to their normal position. A Y-valve (diverter) would cut out the T-pieces and make it more idiot proof for more money. However, nothing much happens if you turn any of the valves randomly. Either toilet won't flush, basin won't drain or flushing simply suck air. Nothing dangerous and you really, really have to be trying to get it wrong as long as the T-pieces are above the waterline.

I used to get some odour but this cured it completely. I only fresh water flush every 6-8 weeks when living on the boat during summer. I imagine I'd give it a quick flush before leaving if only sailing at weekends. It is also simple enough to add something to the water in the basin to kill an existing problem more rapidly.

Yes, i think that as I already have the two skin fittings and seacocks, a valve bridging the two is simplest.

I think the sea water in our little marina is less than sparkly clean just now.

 

[Wing Mark]

If your question is simply “where to buy valves”, ASAP Supplies is a decent answer.

Pete

Proper job from Whale 66 quid.