the tube is the drain!
go get a small rubebr cap, like bike tire valve cap nose spray caps work well. something that will fit it and not let fluid drip.
first try to tighten the wing nut.
if that dotn help put a cap on her

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i have yet to find some one else who when changing their oil ( every 2000 miles or when they get bored ) details the under side of their car.
X-C April 2010,Heads, Cam,Internals April 2011, or blown engine, witch ever comes first.
The transformation has begun!