I am trying to built a eco filter system with minimal (paid) power consumption.

So I have got a OHF, and a mini water pump powered by USB. The problem I am facing now is that the pump outlet is only 8mm and I can't seems to find 8mm piping, L-joint and rainbar.

Anyone knows where I can get them for sure?

Alternatively, I also bought a USB power air pump. Is it possible to build a air lift system to work with OHF?

The final stage will be to power either of this device to a solar panel which will be powering it and hopefully will be self sustaining in the balcony.