Wireline & Mechanically Set Sleeve Valve Cement Retainers are used for secondary cementing operations. These drillable retainers set securely in any hardness casing. A ratchet lock ring stores the setting force in the retainer. The one piece packing element and metal back up rings combine for a superior seal. The case hardened, one piece slips virtually eliminate premature setting, yet can be easily drilled out. Wireline set are available for 4 1/2″ through 20″ casing. Mechanical set are available for 4 1/2″ through 16″ casing.