There are two highly reliable ways to go. You can go with a 1 3/8 inch OD
aluminum tube and wiggins couplings or you can go with AN-20 1 1/4 inch ID
or AN-24 1 1/2 inch ID SS braided hoses and fittings.

Paul,
Do you know of a good source for the items mentioned above??  If I use 1 3/8 inch OD aluminum tube with the Wiggins I bought, what is the best way to bend and route the tube within the cowl?
Don Mitchell

Burns Stainless has 1 3/8 OD .065 wall 6061 tubing bends. Any tube supply
house in the US has 1 3/8  OD .065 wall 6061 tubing. Search www.google.com
for a tube supply house near you. You will then need to tig weld pieces
of tubing together to get what you need. You can then either tig weld
the wiggins on or bond them on with JB Weld for aluminum
bonding. High temp epoxy would also work. In any event you will
need the services of a tig welder. If you order a custom rad
and you intend to use the wiggins specify 1 3/8 OD plain inlets
and outlets. The same goes for AN lines. Most if not all custom
rad guy can give you AN fittings on the inlet and outlet of the rads. 

There is also available from Summit Racing (800) 230 3030 and 
others, corrugated stainless water pipe that can be bent to shape. 
As you see here Chuck Dunlap used this stuff. However Chuck used hose 
and hose clamps. 

I am not sure about the exact dimensions of this stuff  but it is 
probably possible to weld  short pieces of 1 3/8 OD steel tubing 
on the ends of this stuff and bond on the aluminum wiggins couplings.

I am thinking of doing this on my airplane.

You will also need to weld something on the inlets and outlets
of your water pump.

Paul Lamar
 
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