When we empty the caravan main sink the waste water sometimes comes up in the Shower .

[Beachball]

So was your bathroom sink connected to the shower as well.

No the main sink was attached to the shower

 

[Beachball]

Eureka! Thanks for telling us BB.
You‘ll be needing to make one of these.View attachment 2512

DD I have found one on Amazon just about to ordered and it very reasonable

 

[DaveA1]

No the main sink was attached to the shower

That's the same as mine. the shower outlet is a single outlet.

It appears with mine if my bathroom sink is full when I pull the plug, the water does a uey and travels back up the shower waste, particularly if I set the van very slightly down at the rear, which is how I try to set it. so the shower drains better, when showering. hence the reason I bought the plug,

 

[JTQ]

The tiny water trap depth of the shower tray will almost inevitably be overwhelmed if sharing a common feed from much higher sink outlets and these handle large flows.
DD's linking of three outlets only improves things by virtue of his use of a vent, as the flows into the waste holding tank.

If using a service pitch note:
Should, that have been unvented as could be the case feeding directly into a service pitch drain hose, the backing issue is likely to return,

 

[Jcloughie]

DD i have a two bracket how much is the one in the picture

Just add a ‘Y’ junction to your existing one.

John

 

[Jcloughie]

The tiny water trap depth of the shower tray will almost inevitably be overwhelmed if sharing a common feed from much higher sink outlets and these handle large flows.
DD's linking of three outlets only improves things by virtue of his use of a vent, as the flows into the waste holding tank.

If using a service pitch note:
Should, that have been unvented as could be the case feeding directly into a service pitch drain hose, the backing issue is likely to return,

Never seen a caravan with a trap on any of the facilities. Has any van got one, I would think there is insufficient height on the shower and too restrictive on sinks and basins as well as adding to the original price.

But the depth of the tray could well be overwhelmed.



John

 

[RogerL]

Never seen a caravan with a trap on any of the facilities. Has any van got one, I would think there is insufficient height on the shower and too restrictive on sinks and basins as well as adding to the original price.

But the depth of the tray could well be overwhelmed.



John

The sinks have a rudimentary trap as the flexible hose comes through the floor and then rises slightly to meet the solid pipe which is attached to the floor.

 

[JTQ]

Never seen a caravan with a trap on any of the facilities. Has any van got one, I would think there is insufficient height on the shower and too restrictive on sinks and basins as well as adding to the original price.

But the depth of the tray could well be overwhelmed.



John

You surprise, seems sloppy practice not to. Surely there will be smells if they don't use traps?
Both our Hymers have them at the shower and all sinks, never thought UK vans would not have this very basic refinement.

Mine appear to be these, integrated into the sink/shower drain. The underside cap screws off for cleaning, all very neatly designed.

They probably are little more than a CM "head", but clearly work.

Edit: Roger points out the use of the flexible to form a trap, but that means many will be in convoluted piping, not ideal for self-cleaning, and probably a difficult task to remove to clean?

 

[Beachball]

That's the same as mine. the shower outlet is a single outlet.

It appears with mine if my bathroom sink is full when I pull the plug, the water does a uey and travels back up the shower waste, particularly if I set the van very slightly down at the rear, which is how I try to set it. so the shower drains better, when showering. hence the reason I bought the plug,

The shower is now a single outlet (but it was joined to the main sink)
But hoping now it will drain better

 

[Jcloughie]

You surprise, seems sloppy practice not to. Surely there will be smells if they don't use traps?
Both our Hymers have them at the shower and all sinks, never thought UK vans would not have this very basic refinement.

Mine appear to be these, integrated into the sink/shower drain. The underside cap screws off for cleaning, all very neatly designed.

They probably are little more than a CM "head", but clearly work.

Edit: Roger points out the use of the flexible to form a trap, but that means many will be in convoluted piping, not ideal for self-cleaning, and probably a difficult task to remove to clean?

Yours look excellent. I have never seen them before. This link shows them better. It would add £70 plus to a vans initial price. All vans I have owned have been piped directly to the waste.

I don’t think the convoluted pipes form a proper trap. Not in the those I have seen. Just the natural shape formed when it changes direction.

While smells could come into the van. They should never run into open drains. Even on serviced pitches they run into a trapped gully.

John

 

[JTQ]

It would add £70 plus to a vans initial price.

They are an alternative to the sink waste fitting, which would be needed if these were not used and of course cost something, so offset the full cost impact of fitting them.

The smells might simply be the putrefaction of the sludge inevitably lining the van's waste system; more an issue in builds using convoluted hose. Much of our Hymers piping is the ridged smooth bore tubing.

 

[Jcloughie]

They are an alternative to the sink waste fitting, which would be needed if these were not used and of course cost something, so offset the full cost impact of fitting them.

Good point. I think though that the lack of them is indicative of cost cutting by some, (I think most), manufacturers.

As yours is a Hymer. I wonder if continental manufacturers work to different regulations or just trying to provide a better product.

John

 

[Raywood]

If you do not cure it with one of the suggestions here, you can put a tight fitting plug in the shower plug hole as a short term measure.

 

[DaveA1]

If you do not cure it with one of the suggestions here, you can put a tight fitting plug in the shower plug hole as a short term measure.

Posts #20 #53 Have been using a plug for years, saved a lot of messing about

 

[Beachball]

Posts #20 #53 Have been using a plug for years, saved a lot of messing about

I have now put a plug in like you suggested just in case

 

[Dustydog]

I have now put a plug in like you suggested just in case

Why? You have been replumbed with 3 outlets!
Regular cleaning of the whole water system via the drainage bits solves the issue👍👍

 

[otherclive]

I have now put a plug in like you suggested just in case

That doesn’t seem logical considering the modification to your drainage arrangements. Even without an arrangement such as yours I never had the problem that you had. Just prior to leaving a site I would run the remaining hot water into the bowl and just pour it down the main sink, and a warm bowlful diwn to bathroom sink. Then I’d drain the hot water tank for travelling.

 

[ProfJohnL]

Good point. I think though that the lack of them is indicative of cost cutting by some, (I think most), manufacturers.

As yours is a Hymer. I wonder if continental manufacturers work to different regulations or just trying to provide a better product.

John

Not" cost cutting", Cost avoidance as they were never previously used in UK caravans.

 

[Beachball]

That doesn’t seem logical considering the modification to your drainage arrangements. Even without an arrangement such as yours I never had the problem that you had. Just prior to leaving a site I would run the remaining hot water into the bowl and just pour it down the main sink, and a warm bowlful diwn to bathroom sink. Then I’d drain the hot water tank for travelling.

I did put just in case the plug would be use but i would like to see it use first and see if everything is ok and my first outing in April 2022 so there might be a update to this

 

[otherclive]

I did put just in case the plug would be use but i would like to see it use first and see if everything is ok and my first outing in April 2022 so there might be a update to this

Await it with bated breath 😊😊😊

 

[Dustydog]

Await it with bated breath 😊😊😊

Maybe a back flush if BB‘s shower is connected to the toilet😜

 

[otherclive]

Maybe a back flush if BB‘s shower is connected to the toilet😜

If that doesn't work perhaps a Gerberit might be a worthwhile addition until composting toilets become mandatory.

Sheer bliss

 

[Beachball]

When tested at the caravan repairer he said everything was ok but a plug would not hurt so we have one in stock now

 

[Beachball]

Just add a ‘Y’ junction to your existing one.

John

Hi John would a Y junction work to my double drain away caravan waste pipe adapter in the photo below

 

[Dustydog]

Hi John would a Y junction work to my double drain away caravan waste pipe adapter in the photo below

BB
Are your three outlets adjacent?