Partitions or baffles
between compartments shall be of solid, durable material and
shall extend not less than 4 inches (102 mm) above the liquid
level. The transfer port between compartments shall be a minimum
size equivalent to the tank inlet, but in no case less than
4 inches (102 mm) in size, shall be installed in the inlet compartment
side of the baffle so that the entry into the port is
placed 65 percent to 75 percent in the depth of the liquid.
Wooden baffles are prohibited.