What Does the Charcoal Canister Drain Nipple Connect to?

[Buzz Skyline]

I think I finally know how I want to mount the charcoal canister, but I haven't figured out what I need to do with the nipple labeled "Drain". The other two, that go to the purge and gas tank are clear enough.

Should I just plug it? If I don't either plug it or connect it to something, I'm afraid it will essentially become a vacuum leak when the purge solenoid opens.

[Jaime]

The purge solenoid draws the fumes out of the charcoal. It needs to draw fresh air to do that properly. Make sure the drain is open, I simply left mine not connected to anything.

The solenoid is controlled by the ECU and won't open when a loss of vacuum is a problem.