I cant seem to grasp this subject.
For chem equip they list off S.T. Joint sizes like 29/42 and S.T. INNER joint sizes. I dont understand what these mean, what 'part' of the equip they are reffering to and how to read them??
Whats a thread size too, It lists thread sizes for chem equip, but I dont know wut part of the attachment its reffering to either?