"Neil Jones" wrote in message
...
"Martin Sykes" wrote in
message ...
If a hose has an internal diameter of 13mm, then
13 mm diameter = 6.5 mm radius.
Oops, well spotted. In which case, it's a quarter of what I said
= about 1.5 gallons
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Martin & Anna Sykes
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http://www.users.globalnet.co.uk/~sykesm