Technical Radiator overflow tank

Me too, got it on e-bay

 

my canteen came from my 50's flathead dragster that i bought in 1975. each head at the water outlets had a spindal cap w/fitting soldered on and a tube from ea. head into the canteen, mounted upside dowe so after a run would just opened the cap to drain ?? why?? i didn't put it back on when i redid the dgstr, still have it, last run in 1983.....time flies