Attaching a liquid post to randall

[fusa]

I recently received the Deluxe Randall from HomebrewStuff. I want to attach a ball lock liquid post to the output of the housing. Anyone know what fittings I would need? I am a bit confused about the measurements of the threads.

 

[Peter_h]

You need this fitting.

Cornelius Post - 1/4" MPT

Kind of pricey but a regular flare fitting will not work w/ a cornelius post.