Seal Bore Extension is used in completions where a seal bore packer is used as a production packer and tubing movement is expected. Seal Bore Extension provides sufficient seal bore length so that long seal assemblies accommodate tubing movement while always remaining in the seal bore. Multiple seal bore extensions can be coupled together using a concentric coupling to obtain more seal bore length. Seal Bore Extensions are available for all sizes of seal bore packers. Seal Bore extensions are manufactured from materials that comply with NACE MR0175 STD. For SSC-resistant metallic material.