Abstract: In order to provide additional flexibility in a portable restroom, a base assembly is specifically designed to include an internal tank capable of maintaining and carrying flushing fluid. Thus, when a flushing restroom is desired, an additional tank is not needed. In order to convert to a flushing model, the base assembly is simply filled with appropriate liquid, and a pump is added. In addition to providing additional capabilities, the additional fluid in the base unit provides for more weight, thus increasing the stability. Also, the base assembly has a support structure which can be snap fit to the tank member. By allowing the snap fitting feature, the support structure can be designed very rugged, however will very easily and completely attach to the tank member.