A sealing assembly (20) for sealing against a piece of oilfield equipment (50) in a wellbore. The sealing assembly has a support housing (30) and the support housing defines an inner wall (31) and a port (34) configured for fluid communication with the wellbore. Such inner wall defines a stop shoulder (32), and the support housing has a limit structure (33a,b) proximate one or both end(s). A sealing element (40) is contained within the support housing. A ring (42a,b) is connected to the sealing element at one or both end(s). Each ring is configured for slidable movement along the inner wall of the support housing and further configured to float between the stop shoulder and the limit structure.