Which bulkhead should I get?

[Sythero]

Hey all,

I will be using this hole (1-3/4in) as a drain to my sump. On the top of the bulkhead will be a Durso, and on the bottom will be PVC pipes to the sump.

http://www.bulkreefsupply.com/pumps-...bulkheads.html

Which bulkhead is for me? I don't want my new tank to leak.

Thanks.