1. Standard: API 2. Pressure: 2000psi~20000psi 3. Sie: 3-1/8"~26-3/4" Spacer spool, in accordane with API 6A, have end connectors of the same size, rated working pressure and design. Spacer spool is wellhead sections which have no prevision for suspension of tubular members and which may have no prevision for sealing of tubular members. We manufacture the sapcer spool in all size and pressure ratings suitable for Well Head extension, BOP spacing, and Choke, Kill, and production Manifold applications. We can produce all kinds of API 6A double studded adapter for wellhead use. It is important for wellhead use. It is important device to connect the different flange for wellhead, so the material of the body and studs and nuts shall be conforms the related requirements. The size is in accordance with API flange certification.