Several times on the rotary lists people have mentioned a tiered cooling
system.  One in which a primary cap spills over into a pressurized
reservoir.  I have been trying to set up such a system except that the
secondary (upper) seal on a radiator cap will not hold any significant
amount of pressure.  So the pressurized reservoir only spills coolant
around the primary radiator cap.  Does any one know of a cap that will
hold pressure (at least 20 psi) to its reservoir?

David Leonard
The Rotary Roster:
http://members.aol.com/_ht_a/rotaryroster/index.html