i dont think
Home Depot or
Lowes has fittings that small (and if they do, they'ld probably be very bulky), but you can look. you might also try browsing thru a local aquarium or pond shop...
if you find anything, let us (me) know
edit*
damn, im freon-cooled now? i havent even got my watercooling stuff set up yet. guess i gotta send it all back and make a phase-change system now
