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Why is your waste going into aquaroll?  These should be used to supply water.  You need a waste master for waste this is flatter and will fit properley.

Lots of people use aquarolls for waste water as well as fresh. (clearly marked of course) I myself like the wastemaster as it also holds the cassette loo as you trundle ocross the field lol

Robin

The Aquaroll is really not designed for waste water as it is too high, if you get the right container the problem should be solved.  If you were ever on a sloping pitch where the outlet end was low it would be impossible to use an Aquaroll. Do you use an Aquaroll for fresh water too?  Best plan is to sell the second Aquaroll and buy a Wastemaster or similar.  Plenty of secondhand ones around.

Fit a short piece of pipe to each outlet and join them with a Y piece and run a single pipe into the Wastemaster.  You could also make up a solid outlet using household plumbing bits, I think David Klyne and a few others  have posted pictures of how they did this.

Are your waste oulets not next to each other?

Mine are side by side on the side of van so have 2 waste pipes going into each opening on waste master.

we had this on the old caravan it had a side outlet too,and the causes after many go's at it was....  the pipe was too long on the outside.make sure it only just goes into the top of the waste barrel.if its in the water it takes time to go down and flushes back.the caravan must be level if it slopes away from the waste outlet it will come back or not leave the pipe.i see its a 1991 van,the waste may need cleaning out due to fats blocking the pipe.use a waste unblocker,block off the waste pipe outside but not completely the pressure could push the pipes off fill with warm water and waste unblocker for a few minutes then release.i use fenwicks FENDOX ... www.fenwicks.info

CLICK ON

Could you get rid of the Y piece and run two separate hoses into the waste tank?

I was having a look under my van the other day and I noticed that the drains from the kitchen sink and toilet sink joined together for one outlet and the other outlet is for the shower tray. I thought one outlet serviced each side of the van.

However, another thing is that the waste in the wash hand basin always takes a long time to go down, so I think your points have laid it on the nail, so to speak, thanks!

welcome