When is it acceptable to fill an MWS apparatus from the top with a portable fill device?

Filling a Mobile Water Supply (MWS) apparatus from the top with a portable fill device is acceptable when the apparatus has no other filling options. This approach is often necessary when other filling methods, such as side or rear inlets, are unavailable or obstructed. Utilizing a portable fill device ensures that water can still be added to the tank effectively, maintaining operational capability during incidents.

In addition, filling from the top may be the most efficient solution in certain situations, particularly when accessing ground-level filling points is impractical or unavailable. Understanding when and how to utilize the available filling options effectively is crucial for maintaining the readiness of the apparatus and ensuring rapid response times in emergencies.