Fuel tranfer

Looking for safety in fuel transfer, I develop this small and simple system based in a one that uses a marbie, but here I created a valve to make it all printed and the diameter to use the garden hose, or any hose on that diameter, I used 13,5mm.
For the axis I used a nail 17x27, and let it very easy to open and close.

To use this one you just need to shake it up and down quickli until the fuel start to run.
The "valvula transfe baixo" and "valvula transfe cima" I modified the size, I didn't test this one, 'cause the first one I've made, the fuel flow slowly, so, I changed the size of the valve to let it flow more.
The "valvula transfe cima 1" and "valvula transfe baixo 1" are the one I've tested and that worked.

I hope you enjoy and make your job more easily. Thanks!