Type of bulkhead (wet side + dry side) - threaded + threaded; threaded + slip or slip

[gregzz4]

Glad you got that sorted out

Now for my other question;
You mentioned you put an o-ring between the bulkhead and the drain pipe
I'm trying to picture how this is possible
If you threaded the drain pipe into the bulkhead that far for the o-ring to touch you'd probably split the bulkhead

You didn't by chance put the drain pipe on the outside of the bulkhead did you ?