Patent ID: 7237618

Claim:
A stripper rubber having a generally cylindrical upper moiety and a dynamic generally frusto-conical lower moiety and having an inner diameter, wherein the upper inner surfaces of the and lower moieties cooperatively define a bore for receiving oil field equipment, the stripper rubber comprising: a generally ring-shaped adapter insert at least partially within the stripper rubber and disposed toward the upper moiety of the stripper rubber; and a structural retention assembly, the assembly further comprising: one or more support members proximately and dynamically suspended from the stripper rubber upper moiety and at least partially external to the stripper rubber lower moiety outer surface; and one or more structural retention inserts at least partially within the stripper rubber and distally attached to the one or more support members, wherein the stripper rubber dynamically forms a fluid-tight seal around varying outer diameters of oil field equipment as the equipment is lowered or raised through the bore.