Thanks for responding. Yes, it's a 20-3/4" bore to be exact and 3000 psi working pressure rating.
The hub connections were Cameron's design, kind of a hybrid between the Grayloc and existing API connections. They're almost extinct, I've been in BOPs for 10 years and this is the second time...
I'm working on a 20-3 BOP that has hubbed end connections. This is one of the old Cameron-developed connections and this is one of the sizes that did not get adopted by API. So I'm trying to find out if there is any standard that governs this. The only source we have found is the vendor...