Numatic Hi&Lo NHL15 Original Instructions Manual page 30

To replace the waste-water tank fit into the drum and lock in
place with the red locking clip (Fig 20).
If the waste tank is not locked, the machine will lose
performance.
Locate the handle into the front of the drum (Fig 21).
Refit the dome and lock in place with the toggles.
(Fig 22)
Fit the solution tube to the front of the machine (Fig 24).
The tube simply push fits into the quick release fitted to the
front of the machine.
Replacing the waste-water tank and dome.
Fig 20
Fitting the vacuum hose.
Fig 23
Connecting the solution tube.
Fig 21
Fit the Vacuum hose to the front of the machine (Fig 23).
Lock into place by twisting the hose securing onto the lugs
moulded into the neck of the machine.
Fig 22
Fig 24