SS Coupler recommendations for welding to kegs

Started work on my Electric HERMS setup using 3 15.5G sanke kegs I picked up. I cut the tops of the kegs and have cleaned them up and started marking the locations of all the holes I will need to drill add all the ports/probes etc. Up until now I have used weldless fittings so I don't know what to purchase.

I am having someone else weld everything I need to the kegs, but I want to purchase all the couplers/fittings I will need in preparation for the work.

So I looking for recommendations for merchants to purchase these from. Thanks!

David

I think www.bargainfittings.com should have everything you need.

Also have a look at this:
https://www.homebrewtalk.com/f51/greenmontis-keg-tool-177038/#post2049641

It will make welding the fittings easier and cleaner.

Thanks for the info, I will take a look. Just cut the top off my last keg so I will need these soon, of course even if I order them today with the snowmageddon hitting here in the Chicago area I won't get them anytime soon!!!