Above level mate but thanks for asking any questions mate as i am losing my ship with reasons.
No one way valve just hose mate but my next step is getting the correct oil drain fitting although supplied the incorrect one to begin with.
I have gone too far and may be chasing my tail but we saw oil coming out of turbo with no oil drain at all, just into container whilst engine running but could've been oil residue sitting in turbo already from past tests which is frustrating.
Here is a clear tube pipe installed test and its flowing.
http://youtu.be/LUwiSzxdV84
Oil from turbo...I'm solo here so video is crap
http://youtu.be/bEXliAD9Juc