Who's running Vibrant vacuum manifold?
 

In particular, the newer one with the larger diameter center port?

I know the 6 smaller ports are 1/8 NPT but what is the larger, single and centered port? 1/2 or 3/8 NPT?

I measure the ID of the 1/8 NPT and I get 11/32" (digital mic). The ID of the larger one is 37/64".


http://www.3sx.com/store/catalog/vac...ockpic-600.jpg

Nevermind...3/8 NPT it is.