Large Bore Model MR-3D Double Grip Retrievable Casing Packers are used in production, stimulation and testing operations where maximum I.D. is required . Their hydraulic hold down is below the pressure equalization valve. They feature a proven three element packing system and a balance sleeve device to assist in keeping the by-pass closed. They are available for 5 1/2" through 7 5/8" casing.
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