assembly capable of being arranged in a perforation are described assemblies which can be arranged in an underground perforation. an assembly may include a body and a member which is made of a material other than the material of which the body is made. the member can be located in an opening in the body and can be attached to the body. the member coupled to the body can define an internal diameter and form a seal for the internal diameter. the limb can be crushed to access an environment external to the limb and body, for example, to create a well drilling branch.
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