Toastmaster TPC4000 Use And Care Manual page 20

MAXimum Fill Line: The line inside the Pressure Cooker Pan
indicates the Pressure Cooker is 2/3 full.
For most foods, it is safe to fill the Pressure Cooker Pan 2/3 full.
When cooking foods that expand, such as rice, dry beans and
legumes or recipes containing these foods, do not fill the Pressure
Cooker Pan more than 1/2 full. Fill only 1/2 full when cooking stocks
or soups.
CAUTION: NEVER fill the Pressure Cooker Pan with food or liquid
beyond the 2/3 MAX Fill Line. Overfilling the Pressure Cooker with
food may result in preventing the steam from being released through
the Pressure Lift Pin and Pressure Regulator Valve. Do not let any
portion of food extend above the MAX Fill Line.
18.