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post #4 of (permalink) Old 11th February 2009
Technical Supremo

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Which ever way you look at it the drains don't seem to be coping. Some of the drain tubes have a rubber one-way valve at the bottom and these can become stiff or blocked. I suggest you find the ends of the tubes and check.
When you find the valves you'll wonder why they ever fitted such things and most people just cut them off.
The valves are there to stop pesky insects and varmints crawling through.
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