Every One of the feasible external leakage details amongst the stem & gland flange, gland flange & human body, and human body & adapter are sealed by using a Key O-ring and afterwards a secondary graphite gasket. In the one-piece style ball valve, the body might be Solid/cast as a person piece. https://bookmarkssocial.com/story19405469/the-2-minute-rule-for-ball-valves