What is not a requirement for pump tank water extinguishers regarding the weight marked?

The requirement for pump tank water extinguishers includes specific markings for certain weights, which help ensure proper handling and maintenance. Among these, the total weight, which represents the combined weight of the extinguisher and its contents when full, is typically not marked.

Instead, extinguishers are generally required to have markings for full weight, which denotes how much the extinguisher weighs when it is completely filled and ready for use, and for empty weight, indicating the weight of the unit without any extinguishing agent. The unrecharged weight is generally understood to indicate the condition of the unit once it has been used and has not yet been refilled.

By omitting the total weight marking, the focus remains on the operational aspects needed for service maintenance and understanding how the extinguisher functions in an emergency situation, rather than on a cumulative weight that may not be as relevant for users or technicians. Thus, the total weight is not a required label for pump tank water extinguishers, making it significant for compliance purposes.