They are not open to the inside of the radiator. They will not let coolant out. Most people cap them just to keep the inside of the fluid cooler clean incase it get used on an auto car again someday.
JackB nimble JackB quick JackB can suck my dick =P - james-lee 11/02/01 Arrogance is the #1 weapon against Supra Owners - MikeH 08/06/02 Dallas with a Z: I like the bulge dude 05/02/03 Bezbefootball: Does dick have anything for me? 10/21/03