Beananimal Overflow - Ball or Gate Valve?

[Werbo]

I posted a "hail mary" in the buying forms. If no one has a gate valve in Victoria it looks like I'll have to order one.

Just want to make sure that this will do the trick? I think I want the slip to slip rather than threaded.
Please advise.

http://www.conceptaquatics.ca/index....-ii-sch80.html

Thanks in advance...