Don't trust a sketchy chinesium tank to keep your coolant inside your motor.  This sturdy 1 1/2 quart coolant tank was fabricated in the USA.  The tank features an 1/8 npt and a 3/8 npt port in the bottom and an overflow spout in the neck.  Connect the bottom ports to your overflow hose, steam port, or a suction coolant line.  The lid determines if the tank is an overflow or an expansion tank.  If you change your setup, simply change the cap instead of buying a whole new tank.  Tank ships with one non-pressure cap.
 
Tank measures 4.5" wide, 5.5" deep, and 8.5" tall.