The airhose is going to be "looped" around the bottom of the tray. But instead of the way you have it (lengthwise), it's going to be facing towards the right side of that picture (towards the white drain)...thread through the holes in the top front of the unit (not the side). It's held in place by two suction cups that should be on the floor of the unit holding the hose down as deep as it can be in it. The sides are for the power cord to the pump to come out (either one is cool, but I use the side with only 1 hole). Remember I told you that I had some slight leakage from the unit...it was where you have your airhose thread through in that picture. I just stuffed those holes with extra neoprene from the cap cutouts. The thing that you are having trouble identifying I believe (it's been awhile) gets screwed into the top of the pump and is the interface between the pump and the water dispersal unit (the thing that sprays and looks like a two squares put together with holes in the top). You'll want to make sure you have that in place with the doo-hickey that you were trying to identify.....and then put those red thing-a-ma-bobs screwed into the top of the water dispersal unit. The really important thing is that when you screw them in...they all face the same way.....not towards each other.....I mean literally turned the same way.
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