Wireline Re-Entry Guides/Ball Catcher Subs Crossover Wireline Re-Entry Guide / Ball Catcher Sub is installed on the bottom of the production string to allow the tubing string to be pressurized. When the differential pressure at the tool reaches a predetermined value, the ball and seat are pumped out of the tool. After the ball and seat have been pumped out, these subs allow unrestricted access from the tubing into the casing below the tubing string. These products are available in a variety of configurations. They can be furnished with a mule shoe, half-mule shoe, solid pump-out plug and conical guides for easy entry when running the tubing through the top of a liner or into a sealbore packer. Specification Guide Size* Ball Diameter* Nominal ID After Shifting Standard Thread Specification Box Up** *Standard ball size. Other sizes available upon request **Standard thread specified. Other sizes available upon request 2 ⅞" 1 ¾" 2.437" 2 ⅞" EU 8 RD 3 ½" 2 ½" 3.000" 3 ½" EU 8 RD