Provent oil drain

[mudski]

Thanks for the comments. Seems the common solution here is hose and valve down the side.
I did research Mann (the Provent maker) and they suggest either return oil to the sump, or vent the "cleaned" air to the atmosphere. Either way, there is minimal oil build-up in the catch can.
I think (but do not know) that blocking both oil drain and return air has some effect on the way the Provent works. Return air is under back pressure from crankcase pressure. More work to do

Venting into the atmosphere is illegal and if caught you will see a hefty fine. Even running a catch can is illegal, as the old laws have not been changed since the invention of a closed circuit system rather than an open circuit. I had to remove my Provent when I had the Patrol engineered.
The extra work required to plumb it into the sump, you will need a non return valve too, its seriously not worth it. It takes minutes to turn the tap on and drain it when you do a service.
But its your car, your choice.