Patent ID: 8042575

Claim:
A sealing plug for sealing an opening in a part, comprising a plug body insertable into the opening for closing the opening; an annular sealing member circumscribing the plug body for sealing to a wall of the part surrounding the opening to prevent the passage of fluid through the opening past the plug body; a backstop having a radially outward flange portion disposed axially inwardly of an axial inner end of the plug body for engaging an axially outwardly facing shoulder surface of the part; and a resilient member interposed between the backstop and the plug body for resiliently biasing the plug body axially outwardly; wherein the plug body has a radially inwardly stepped end forming an axially outwardly facing stop surface for engaging a retainer engaged in and protruding from a radially inwardly opening retainer groove in wall of the part and an axially extending locking surface for preventing the retainer from moving radially inwardly to an extent that would allow retainer to disengage from the retainer groove; and the resilient member resiliently biases the plug body from an axial release position for allowing the retainer to be engaged in or disengaged from the retainer groove to an axial locking position for locating the locking surface radially inwardly of the retainer to prevent its removal from the retainer groove.