GE WSSH300G Technical Service Manual page 19

To allow the cavities to empty, the cover of the detergent
drawer cover has tubes molded into it. The tubes fit over
the tubes in the cavities.
These tubes are larger than the tubes in the cavity and
are designed to fit over the tubes, but not touch the
bottom of the cavity when the cover is installed. When
water is added to either the bleach or fabric softener
liquid, the mixture level rises between the tubes above
the tubes in the cavity and flows into the washer tub.
Since the end of the tube on the insert does not touch
the bottom of the cavity, a siphoning action will start
when the solenoid activates and allows water into the
cavity. The added water creates an "overfill" condition
and starts the siphoning. The cavity will empty itself
when the water is turned off by the solenoid.
The bleach dispenser channel receives water from the
left-hand input, as viewed from the front of the washer.
The bleach channel forms a path that allows the water
to pass over the bleach cavity section of the cavity.
As the water pass over the bleach section, holes in the
cavity allow some of the water to enter and mix with the
bleach.
This raises the mixture level above the tubes in the drawer
bleach cavity allowing the mixture to flow into the tub.
19