Wall bushing for pipes and cables

Claim 1

A WALL CLAMPING CONDUIT BUSHING FOR SEALING A WALL OPENING ABOUT A CONDUIT PASSING THROUGHT SAID OPENING, COMPRISING A HOLLOW SPLIT BOLT ADAPTED TO RECEIVE SAID CONDUIT AND A SEALING COMPOUNDS, A FLANGE ON SAID BOLT FOR ENGAGING ONE SIDE OF THE WALL, A SHARP, AXIALLY EXTENDING RIDGE ON SAID FLANGE EXTENDING AROUND SAID BOLT DEFINING A RECESS FOR RECEIVING SEALING COMPOUND ON SAID ONE SIDE OF THE WALL, A SPLIT NUT ON SAID BOLT HAVING A FLANGE FOR ENGAGING THE OPPOSITE SIDE OF THE WALL, AN AXIALLY EXTENDING RIDGE ON SAID FLANGE EXTENDING AROUND THE BOLT DEFINING A RECESS FOR SEALING COMPOUND ON SAID OPPOSITE SIDE OF THE WALL, MEANS CONNECTING SAID NUT HALVES RIGIDLY TOGETHER ON SAID BOLT, SO THAT THE NUT MAY BE TURNED ON THE BOLT TO CLAMP THE WALL, SAID RIDGE ON SAID BOLT FLANGE BEING ARRANGED TO BITE INTO THE WALL AND HAVING A NONCIRCULR CONFIGURATION TO PREVENT TURNING OF THE BOLT WHEN THE NUT IS TIGHTENED SO THAT THE NUT MAY BE TIGHTENED FROM SAID OPPOSITE SIDE OF THE WALL WITHOUT HOLDING THE BOLTS ON THE ONE SIDE OF THE WALL.