No. The shower floors are not dropped, and grey water tank is slightly lower and mounted in front of the
axle. The older trailers have a P-trap and a gate valve to keep the grey water out of the shower floor pan when traveling and when the tank excessively full. In recent years
Casita started installing HEPVO valves to replace the trap and gate valve. It is a very popular and recommended retrofit modification with the
Casita crowd if you have the P-trap trailer. The Retrofits drove
Casita to start installing the HEPVO valves.
Eddie