Does the milk go through the tubing on the BWW Petite Portable Single Electric Breast Pump?

No, it should not. The BWW Petite Portable Single Electric Breast Pump is a closed loop pump, which means it prevents milk going into the tubing from the flanges.

Caution

If any milk gets into the tubing, please stop pumping to avoid liquid flowing into the motor of the pump. Remove the tubing, clean, dry, and reassemble.