In combination, at least one pipe element and a coupling; said pipe element comprising; an outer surface surrounding a longitudinal axis; at least one end; a groove positioned in said outer surface proximate to said at least one end, said groove extending circumferentially around said pipe element, said groove comprising: a first side surface proximate to said at least one end; a floor surface contiguous with said first side surface; a second side surface contiguous with said floor surface, said second side surface being in spaced relation to said first side surface; and wherein said first side surface projects radially outwardly beyond a remainder of said outer surface of said pipe element; and a tooling mark positioned in said outer surface and extending circumferentially around said pipe element and said coupling comprising: a plurality of segments attached end to end surrounding a central space, said at least one pipe element being received within said central space; each of said segments having at least one key (138; 146) projecting toward said central space, said at least one key engaging said groove, said at least one key comprising: a first key surface (140; 148) engaged with said first side surface of said groove; a second key surface (142; 150) contiguous with said first key surface and facing said floor surface of said groove; and a third key surface (144; 152) contiguous with said second key surface, said third key surface facing said second side surface of said groove; characterized in that the tooling mark comprises a shallow depression and/or embossed indicia for guidance for proper installation of the pipe element relative to the coupling. an outer surface surrounding a longitudinal axis; at least one end; a groove positioned in said outer surface proximate to said at least one end, said groove extending circumferentially around said pipe element, said groove comprising: a first side surface proximate to said at least one end; a floor surface contiguous with said first side surface; a second side surface contiguous with said floor surface, said second side surface being in spaced relation to said first side surface; and wherein said first side surface projects radially outwardly beyond a remainder of said outer surface of said pipe element; and a tooling mark positioned in said outer surface and extending circumferentially around said pipe element and said coupling comprising: a plurality of segments attached end to end surrounding a central space, said at least one pipe element being received within said central space; each of said segments having at least one key (138; 146) projecting toward said central space, said at least one key engaging said groove, said at least one key comprising: a first key surface (140; 148) engaged with said first side surface of said groove; a second key surface (142; 150) contiguous with said first key surface and facing said floor surface of said groove; and a third key surface (144; 152) contiguous with said second key surface, said third key surface facing said second side surface of said groove; characterized in that the tooling mark comprises a shallow depression and/or embossed indicia for guidance for proper installation of the pipe element relative to the coupling. a first side surface proximate to said at least one end; a floor surface contiguous with said first side surface; a second side surface contiguous with said floor surface, said second side surface being in spaced relation to said first side surface; and wherein said first side surface projects radially outwardly beyond a remainder of said outer surface of said pipe element; and a tooling mark positioned in said outer surface and extending circumferentially around said pipe element and said coupling comprising: a plurality of segments attached end to end surrounding a central space, said at least one pipe element being received within said central space; each of said segments having at least one key (138; 146) projecting toward said central space, said at least one key engaging said groove, said at least one key comprising: a first key surface (140; 148) engaged with said first side surface of said groove; a second key surface (142; 150) contiguous with said first key surface and facing said floor surface of said groove; and a third key surface (144; 152) contiguous with said second key surface, said third key surface facing said second side surface of said groove; characterized in that the tooling mark comprises a shallow depression and/or embossed indicia for guidance for proper installation of the pipe element relative to the coupling. a first key surface (140; 148) engaged with said first side surface of said groove; a second key surface (142; 150) contiguous with said first key surface and facing said floor surface of said groove; and a third key surface (144; 152) contiguous with said second key surface, said third key surface facing said second side surface of said groove; characterized in that the tooling mark comprises a shallow depression and/or embossed indicia for guidance for proper installation of the pipe element relative to the coupling.