each of the tanks 45 and 47 the wash cylinder 95 in fig5 should be understood to have both of its end open and therefore there are two discharge spaces 112 provided in tank 45 the discharge spaces are in direct flow communication with the interiors of the associated wash cylinders via the open ends of the cylinders the discharge spaces 112 are of course separated from the wash spaces 109 by the seal members 107 connected in communication within the tank 45 is outlet conduit 115 which functions to withdraw liquid from discharge space 112 pipe 117 is connected between the wash space 109 of tank 45 and the discharge space 112 of tank 47 to provide liquid flow therebetween referring to fig4 the outlet conduit 115 associated with the discharge space 112 in the first tank 45 is connected so that liquid drawn from the interior of the first wash cylinder 104 is carried to discharge the outlet conduit 117 connected to the discharge space 112 in the second tank 47 is also connected to the wash space 109 of tank 45 so that liquid drawn from the interior of the second wash cylinder 105 is conveyed into the first tank 45 the operation of the machine in fig4 can now be understood with reference for example to wash cylinder 105 located in tank 47 conduit 111 carries liquid into the wash space 109 of tank 47 simultaneously a pulp mat is carried between the endless belts 83 and 85 into the tank 47 and with the belts passes under the wash cylinder 105 from the wash space 109 in tank 47 liquid flows through the pulp mat into the wash.