Lucked into a nice matching set of HP100s and planned to double them up without even thinking if the threads were same as the manifold I had already... 
I can still use this manifold on another set of 100s I have, but in the long run would probably like to double these up as well.... I know they're getting harder to find, anyone have one laying around they don't need? I'm in no hurry to get these put together but keeping an eye out now.
Thanks in advance!

I can still use this manifold on another set of 100s I have, but in the long run would probably like to double these up as well.... I know they're getting harder to find, anyone have one laying around they don't need? I'm in no hurry to get these put together but keeping an eye out now.
Thanks in advance!