The device consists of a central core seal and a spring separated from the central core. The spring consists of a projection device with a larger surrogate drill and a smaller internal drill on the top cover, as well as a porous drill and seal.

摘要

Apparatus comprising a First Seal that includes a Central Core and a RIM separated the central coreThe Flange includes a Projection configured to form a Seal with different Inner diameters of a Drill Rod method; variable DIAMETER; and Seal.