Seal plug

A seal plug for use in a conduit having a plurality of passages therethrough for receiving a respective number of elongated members therein to pass them through the seal plug, said seal plug comprising:

• a plug core including at least one radially-expansible seal member having a respective plurality of passages therethrough and adapted for insertion into said conduit in unexpanded condition, the plug core closing and sealing said conduit when inserted therein and in radially-expanded condition, and also when in radially-expanded condition sealing around an elongated member that is inserted in its respective passage;
• a pair of seal plug pressure members each having a respective plurality of passages therethrough and between which the seal member is sandwiched so as to be expanded radially upon axial movement of the pressure members toward each other;
• a removable insert for each passage closing the respective passage in said seal member, and sealed in the passage along the length thereof when the plug core is in the radially-expanded condition, each removable insert consisting of a headed pin passing through the seal member and the pressure members;
• retainer means engaging said removable headed pins to retain them in their respective passages, the said retainer means consisting of an apertured plate having a respective plurality of apertures therein and having each pin head engaged in a respective aperture thereof of smaller diameter than the pin head, each pin head being forcible through the respective aperture for removal of the pin by the application of a suitable force to the pin shaft, and
• axial compression means passing through the seal member, the pressure members and the retainer member for moving the pressure members toward each other to axially compress the seal member and effect the said radial expansion thereof.