As far as I understand, a minimum of 4 couplings will be

necessary per installation.

However the large mayority of us bought 6.

And how were you spreading these things around the cooling system? Where
are they used
such that 4 or 6 seems to be the right number?

Thanks,
David

Well you use 1-3/8 outside diameter aluminum pipe between water pump and rad. That is
two and between rad and water pump so that is two more with two spares unless
of course you are using two rads. You weld or bond these to the 1-3/8 OD aluminum pipe.
These are widely used in the airline aircraft industry, Formula One race cars 
and aerospace. Continental uses them on their liquid cooled Voyager aircraft engine
line. 

Paul Lamar
 
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