The Series 150 Releasing and Circulat­ing Overshot consists of three main external parts: a Top Sub, a Bowl, and a Guide. Internal catch and pack-off parts are determined by the diameter of the fish. Each assembly is designed for a maximum catch diameter. A Spiral Grap­ple, Spiral Grapple Control, and a Type A Packer are used in the overshot bowl when the diameter of the fish is near the published maxi-mum catch diameter of the overshot. When the diameter of the fish is considerably below the maximum catch diameter of the overshot (usually 1/2"), a Basket Grapple, a Mill Control Packer, or Basket Grapple Control are used in the overshot bowl.

 

Spiral Grapple with Spiral Grapple Control & Type A Packer