... Pneumatic tyre union is replaceable,lip-type seal provides primary seal,protects secondary metal-tometal seal and so on. Nominal pipe size: ... weld;Componet Parts:Detachable Nut,Male Sub,Female Sub,Seal Ring,Retainer Segment,Retainer Ring;Sour Service Models to ... kill lines.Features:Replaceable,lip-type seal provides primary seal, protects secondary metal-to metal seal,and minimizes flow turbulence;Butt- ...