Patent ID: 8887365

Claim:
A system for retrofitting a sealed enclosure for performing work therein in order to provide improved exchange of access elements, wherein the sealed enclosure includes an annular port ring having an inner annular face and an outer annular face and being fixedly secured in leak-proof sealed relation in a port in the wall of said enclosure, the inner annular face and the outer annular face of the port ring both extending between a first outermost end and a second innermost end where the second innermost end is in contact with the wall of said enclosure, the system comprising: A) an outer enclosure assembly configured to form a sealed engagement with an annular face of the port ring entirely outside of the sealed enclosure, wherein the outer enclosure assembly is a separate component from the port ring; B) a change assembly having an outermost end and an innermost end, comprising: i) an inner ring having an outermost end and an innermost end, the inner ring comprising a first annular cylinder body having an outer diameter sized to be slidably received by the port ring, the inner ring further comprising a flange at the outermost end of the inner ring, the flange extending outwardly from the first annular cylinder body, wherein the inner ring is configured to form a seal with the outer enclosure assembly, and ii) an access element configured to be positioned within the first annular cylinder body and in sealing engagement with the first annular cylinder body, wherein the access element is slidably removable from the first annular cylinder body; whereby the change assembly is configured to eject a port component into the enclosure when the change assembly is inserted into the annular port ring.