Spacer spools in all sizes and pressure ratings that are compliant to API 6A and API 16A. Spacer spools are suitable for wellhead extension, BOP installation, choke & kill manifold spools and production manifold. End connections are flanged, studded, threaded, clamp hubs or other end connectors (OEC). Some customers uses names like “riser spool” or “surface riser spools”. Customer should specify the length accordingly to stack height. Each spool is pressure, drift and dimensionally tested before shipment.