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when replacing make sure you get the right bung..

if im correct there are to types you will ned the one with the straigt screwdriver slot not the + type (pre 1987)

Quote: Originally posted by mikecandsarhab on 19/10/2011

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i wouldnt expect you have a non return valve that you can turn on a 1993 caravan.
mike

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Hi folks - Thanks for all the help above.

Just an update to this - this was my last outing of the season and to get me through, I got a piece of dowel from B&Q and shaved it down and hammered it in. The hot water tank remained off and we just used kettle for hot water, the was a little drip - but no major water loss.

Back home, I got a new drain plug, hacksawed the old one out as per instructions above and inserted the new drain plug. I then tested the system - it still leaked. 
I took the cowling off to find the pressure relief valve was on its last legs. There was a crack in the threads - again the only option was to break it off and hacksaw it out.

Once the new pressure relief valve was inserted the hot water system is good as new!

Only problem I have now is I can't stabilise the water pressure - either the pump runs all the time or doesnt run when tap is open! Ive checked for leaks, and spent umpteen hours adjusting the whale pressure switch adjustment screw to no avail.

Im guessing maybe the pressure switch has either had it or the diaphragm needs a clean/service? 

Thanks

Iain