Abstract: A gasket for sealing a probe having a probe head and a probe cable between connector flanges, wherein the probe head has a diameter larger than the probe cable, has a generally annular body. The generally annular body includes an upper surface for sealing against an upper connector flange and a lower surface for sealing against a lower connector flange, and has a generally annular inner wall and a generally annular outer wall, the generally annular inner wall forming an aperture. The generally annular body also includes at least one hinge, the hinge including a radially arranged probe cable insertion port, and a slit. The slit comprises opposing slit sidewalls. When the hinge is open, the slit sidewalls allow the probe cable to be inserted into the probe cable insertion port, and when the hinge is closed, the slit sidewalls contact each other with the probe cable insertion port to form a generally annular seal around the probe cable with the probe head in the aperture.