... or nonstandard:Standard TypeAnnular Pipe line Specifications:1. Kinds: Short radius active manifolds, long dadius active manifolds, integral active manifolds.2. Size: 1-1 ... , Choke Valve, Check Valve, Retaining Valve, Shutoff Valve, High Pressure Active Elbow, Well Head Equipment and so on.They are produced ... any queries, pls feel free to contact us! Annular Pipe Line