Every One of the attainable external leakage points between the stem & gland flange, gland flange & system, and body & adapter are sealed with a Main O-ring after which a secondary graphite gasket. Crimp Shank – These fittings are available in various sizes and products to fit any software, https://bookmarksfocus.com/story5064404/everything-about-butt-weld-pipe-fittings