a cartridge receiving chamber 100 that has an inflow male threaded nipple 102 that is configured to be connectable to the discharge end 22 of the overhaul hose 70 a removable container cover 104 is positionable at the outflow end of the cartridge receiving container 100 any suitable connection between the cover 104 and the container 100 is usable the discharge end of the cover 104 has a male threaded spud or nipple 106 in use the cartridge container 90 can receive a cartridge which is not specifically shown and which will dissolve as water flows through the container 90 the cartridge may contain a chemical surfactant that will reduce the surface tension of the water and will thereby make the water u201c wetter u201d other cartridges that may be of assistance to the firefighter can be placed in the cartridge container 90 if the cartridge container 90 is not needed it can be replaced by a double male threaded connector such as the one depicted at 110 in fig7 again the specific structure of this double male threaded connector 110 is not important it takes the place of the cartridge container 90 depicted in fig1 2 and 6 it would be possible to eliminate the double male threaded connector 110 and to have the discharge control valve assembly 92 connectable directly to the discharge end 22 of the overhaul hose 70 referring again to fig1 2 and 6 the discharge control valve assembly generally at 92 includes a discharge control valve body 112 that encompasses a discharge control valve which is not specifically depicted the discharge control valve will typically be a ball valve that is movable between closed and fully opened positions by the actuation of a discharge valve bail 114 the discharge valve.