70 these teeth may be tetrahedron like having an apex oriented at an angle of approximately 45 u00b0 with respect to a radial of clamp half 22 a two triangular surfaces extending therefrom as illustrated alternatively other configurations could be employed similar teeth 90 92 extend from shoulder 58 to interior side wall 94 of ridge 72 the selection of configuration and size of teeth 86 88 90 and 92 must meet the criteria for interferingly engaging and thereby penetrating the anterior side wall of the corresponding groove in the pipe encircled by the clamp half referring jointly to fig6 a 6b 6c and 7 the attachment of clamp 10 to pipes 16 and 18 will be described end 12 of pipe 16 includes an annular groove 100 industry standards generally dictate the depth and width of such groove commensurate with the diameter of the pipe a similar groove 102 is disposed in end 14 of pipe 18 to secure pipes 16 and 18 with one another they are aligned with one another along their respective longitudinal axes and spaced apart from one another to define a predetermined gap 104 therebetween during the alignment process an annular gasket 106 is placed about the opposed ends of the pipes in bridging relationship to cover gap 104 clamp halves 20 22 are placed about the junction of the two pipes to locate ridges 74 76 in grooves 100 102 clamp half 20 is similarly placed about the pipes to locate ridges 70 72 in the second half of grooves 100 102 upon tightening the nuts upon the bolts extending through the paired bolting pads the clamp halves will be drawn toward one another as illustrated in fig6 b during such tightening gasket 106 will be forced into.