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Quote: Originally posted by tango55 on 18/3/2013

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The top flush tank is about the same capacity as the waste holding tank. This is because when you sterilise the top flush tank you then flush it out through the toilet which then goes straight into the bottom tank to which I have found it to be around the same size in volume.

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Our old Coachman had the bench type C4 cassette toilet manual flush and our current one has the C-200 CW manual flush (the E at the end of the CWE means it's the same toilet but electrically operated by 12 volt power). The Thetford C4 is a different designed holding tank to that of the C-200 but the capacity of the flush tank is actually different. The flush tank is 7 litres and the holding tank 17 litres. See details of the Thetford C-200.

http://www.jacksons-camping.co.uk/general/cassettetoilet.htm

It's amazing how you never stop learning.

Quote: Originally posted by firebasher on 18/3/2013

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And so endeth todays lesson !!

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No, what I saying is that in my first post I said that the top and bottom tanks were the same capacity which I was completely wrong as after checking the facts they are actually different so it was a lesson for me too.