Racking arm for a bottling bucket

[Cajun_McChicken]

I've taken to fermenting in my old bottling bucket because I like being able to rack my beer out of the bottling tap right to the purged keg through the dip tube (by jamming the end of the vinyl tubing over the threads on the out post of the keg).

I ran into a problem with the bottling port getting clogged up with dry hops and I though I might like to change it out for something like this:

http://www.ssbrewtech.com/products/miniballvalvewnewrackingarm

Can anyone who owns one of these SS brew buckets tell me what size the threads are on this piece?

Thanks!