Yes, it comes with a suction cup mounting that the unit slides right into for below surface use. I run my Co2 line right into the bottom through a clear tube. That way you can see how much CO2 you are feeding, there by deterimining when to change bottles(DIY). I also use a disposable air stone to further break up the bubbles being fed. On the other end I bought a mini syphon with a tube that fits snuggly into the out flow tube of the unit, cut the tube to about 8" and fixed the syphon tube back onto it. Then I stuck a sponge(AquaClear Mini Replacement sponge) into the other end of the syphon tube and Wallah!!! The CO2 comes out in an extremely fine mist. Really works well for me for a cheapie system. If you do this be sure and push the tube into the out flow, but not far enough to interfere with the impellor. Any questions......let me know.
Len