From verso of card: "In the event of an air raid, light incendiary bombs are likely to start large numbers of small fires. A portable fire-pump which can be operated by two persons by means of a specially designed handle is a useful appliance for dealing with such fires. The portablecanvas tank from which a pump of this kind can draw water is easily replenished from any domestic water supply. . . . A sufficient length of hose should be available with the pump to enable the fire party to enter a building and approach the seat of the fire with the jet."
Incidentally, the illustration shows three women--in heels--operating the pump. :-)