OK, did you get this part #4014050? It is called an elbow connector.
and this part #4014300 called a slotted hose elbow/sleeve.
If you did, part #4014300 is used to get the output hose over the tank rim; just squeeze the output hose into the slotted hose elbow/sleeve piece, leaving enough hose sticking out into the aquarium to insert the elbow connector part #4014050. You will then attach the spray bar to the elbow connector with a short piece of the output hose.
Hope this helps you figure it out. Let us know if this answers your question.