What is it? (Equipment)

looks like parts to a powerhead

Use it to help circulate water, attach tubing from the output running out of the tank to help oxygenate the water, or attach pre-filter or a sponge filter to the input for additional beneficial bacteria growth
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Lamental Jester wrote:looks like parts to a powerhead

 

Pump motor (black thing with the cord)
Propeller (stick thing with the green paddles)
Water pick up/ exit tube with a defector (long tube, plastic thingy on top that's flat)
can not tell what the little black thingy is...

These are all parts of a pump and or powerhead they are designed to come apart like this to clean or change parts.

The little black thingy slides into the top of the power head there there are "slots" . . . it covers them up, I'm not exactly sure what it's meant for, but that's what it does. lol.

I'm guessing that's a Marineland Powerhead, because my marineland power heads have all those parts, and looks exactly the same.

Slip the impeller (propeller thing) into the power head it should "suck" right in, because the impeller is basically a magnet, and the slide and rotate the exit tube/water diffuser under the power head so that it covers the impeller.

slide in the black plastic thing on top of the power head.

Now that I think about it, I think that black plastic thing is meant for mounting the power head to the side of the aquarium, so that it's suspended in the aquarium, and the black plastic thing has a little nub so you can insert it into a "cradle" so to speak (which isn't pictured, so I'm guessing you don't have that part...but it's not really crucial.)

Looks like this (note the cradle is present in this picture)
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Neat! Yeah, I have two marineland powerheads that I have attached to my undergravel filters, which.........I plan on taking out, eventually. lol!!!

Glad we could help!