Well here are the two pages out of our fluval book, I know not the same brand, but the basics are the same....ill try to get the troubleshooting up here next.
INSTALLATION AND USE
3. Prepare intake connections
1. Attach hosing to the intake connector on the AquaStop valve; when you hold the AquaStop valve by its silver lock lever, the input connector will be on your left.
a. Push one end of the hosing onto the valve; push it all
the way, as far as it will go.
b. Turn the lock nut counter clockwise until it is as tight as
you can make it without forcing.
2. Measure and cut the hosing. You will need a length of
hosing that reaches comfortably from the filter canister to
inside the aquarium.
a. Place the AquaStop end of the hosing at the
approximate spot where it will be positioned on the
filter cover once the filter is installed.
b. Stretch out the hosing so it rests over the "intake" rim
connector assembly.
c. At a spot about 4 in. (10 cm) beyond the aquarium rim,
use a utility knife to cut the hosing. Do not cut the
hosing too short.
IMPORTANT: You will want the hosing to be long enough so that its connection point with the intake assembly is always about 3 in. (7.5cm) below the water line. Remember, you can always cut hosing shorter during final installation, if necessary.
3. Push the cut end of this "intake" hosing into the rubber
connector on the intake tube. Push the hosing in by at least
1 in. (2.5cm) without twisting it.
IMPORTANT
• Hosing must follow a straight path with some slack but
no kinks or loops.
• If the hosing is too long, the filter will not work properly.
• The factory-finished end of the hosing must connect to
the AquaStop valve.
• To ensure a watertight seal, the cut end of the hosing,
which connects to the intake assembly, must be kept
under water.
EN-8
INSTALLATION AND U5E
4. Clip the suction cup onto the intake assembly near the
strainer and place the assembly in the tank, making sure
the strainer is at least 3 in. (7.5cm) from the bottom. (If the
tube is too long for the height of your aquarium, remove
the strainer from the intake assembly, cut the tube with a
hacksaw, and then replace the strainer.) Once the intake
assembly is properly positioned, lock it in place by pressing
the suction cups against the glass.
5. Position the top half of the rim connector assembly over
the hosing and push down until it "clicks" to lock the
hosing in place.
4. Prepare output connections
1. The remaining length of hosing will be used for output. Attach the hosing to the output connector on the right side of the AquaStop valve's silver lock lever.
a. Push the factory-finished end of the hosing onto the
valve; push it all the way, as far as it will go.
b. Turn the lock nut counter clockwise until it is as tight as
you can make it without forcing.
2. Measure and cut the hosing. Again, you will need a length of hosing that reaches comfortably from the filter canister to inside the aquarium.
a. Place the AquaStop valve end of the hosing at the
approximate spot where it will be positioned on the
filter cover once the filter is installed.
b. Stretch out the hosing so it rests over the "output" rim
connector assembly.
c. At a spot about 4 in. (10cm) beyond the aquarium rim,
use a utility knife to cut the hose. Do not cut the hose
too short. Remember, you can always cut it shorter
during final installation, if necessary.
IMPORTANT: Remember, to maintain a watertight seal, the connection point between the hosing and the output nozzle should be kept below the water line.