The Seal Bore Extension are generally used in installations where floating seals are required due to excessive tubing contraction. The Seal Bore Extensions have the same sealing bore ID as the corresponding packer to allows a continuous seal bore for the lower most seals of a long seal assembly. The Seal Bore Extensions are available in a variety of lengths.

The Mill Out Extension are designed for use with seal bore packers in installations where a larger inside diameter is required to accommodate the latching mechanism of packer retrieval tools. The mill out extension has a slightly larger ID than the corresponding packer to allow the packer retrieval tool to latch. Mill out extension are available in a variety of lengths and materials.