A conduit coupling assembly configured to clamp to a fluid conduit oriented about a longitudinal axis, comprising: a first arcuate sleeve member; a second arcuate sleeve member; a connecting assembly (18, 28A, 28B) coupling the first sleeve member to the second sleeve member and configured to tighten said first and second sleeve members to a fluid conduit (19, 119) from a non-actuated position to a tightened position; an arcuate radial-split gasket configured to be positioned between said first and second sleeve members and said fluid conduit; said gasket comprising an outer gasket layer and a separate inner gasket layer; said inner and outer gasket layers configured to be selectively engaged with each other; said outer gasket layer having an inner circumferential surface, an outer circumferential surface, and a radial gap extending between said inner circumferential surface and said outer circumferential surface of said outer gasket layer; said radial gap of said outer gasket layer defined by a first radial side wall gap surface and a second radial side wall gap surface; said inner gasket layer having an inner circumferential surface, an outer circumferential surface, and a radial gap extending between said inner circumferential surface and said outer circumferential surface of said inner gasket layer; said outer circumferential surface of said inner gasket layer configured to selectively engage said inner circumferential surface of said outer gasket layer; said inner gasket layer having a radial insert defined by a first radial side wall insert surface and a second radial side wall insert surface; said radial insert of said inner gasket layer extending radially outward from said outer circumferential surface of said inner gasket layer; and said radial insert of said inner gasket layer configured to be received in said radial gap of said outer gasket layer between said first radial side wall gap surface and said second radial side wall gap surface. a first arcuate sleeve member; a second arcuate sleeve member; a connecting assembly (18, 28A, 28B) coupling the first sleeve member to the second sleeve member and configured to tighten said first and second sleeve members to a fluid conduit (19, 119) from a non-actuated position to a tightened position; an arcuate radial-split gasket configured to be positioned between said first and second sleeve members and said fluid conduit; said gasket comprising an outer gasket layer and a separate inner gasket layer; said inner and outer gasket layers configured to be selectively engaged with each other; said outer gasket layer having an inner circumferential surface, an outer circumferential surface, and a radial gap extending between said inner circumferential surface and said outer circumferential surface of said outer gasket layer; said radial gap of said outer gasket layer defined by a first radial side wall gap surface and a second radial side wall gap surface; said inner gasket layer having an inner circumferential surface, an outer circumferential surface, and a radial gap extending between said inner circumferential surface and said outer circumferential surface of said inner gasket layer; said outer circumferential surface of said inner gasket layer configured to selectively engage said inner circumferential surface of said outer gasket layer; said inner gasket layer having a radial insert defined by a first radial side wall insert surface and a second radial side wall insert surface; said radial insert of said inner gasket layer extending radially outward from said outer circumferential surface of said inner gasket layer; and said radial insert of said inner gasket layer configured to be received in said radial gap of said outer gasket layer between said first radial side wall gap surface and said second radial side wall gap surface.