GX Series: The The GXA Sliding Sleeve is a shift-up-to-open tool and the GXO Sliding Sleeve is a shift-down-to-open tool.The GX series of Sliding Sleeve use common machined parts that allow the shift-open direction to be changed from down-to open to up-to-open by simply substituting different sub ends The GX series of Sliding Sleeve are used to establish a means of communication between the tubing string and the casing annulus for single-tubing or multiple-tubing string completions. The GX Sliding Sleeves may be used for directing flow from the casing to the tubing in alternate or selective completions. Other applications include killing a well, spot acidizing and fracturing, or equalizing pressure between an isolated formation and the tubing string. NE Series: The NE series Non-Elastomeric Sliding Sleeves are designed for use in high temperature wells to establish a means of communication between the tubing string and the casing annulus for single-tubing or multiple-tubing string completions. The Sliding Sleeve may be used for directing flow from the casing to the tubing in alternate or selective completions. Other applications include killing a well, spot acidizing and fracturing, or equalizing pressure between an isolated formation and the tubing string.