The Gruvlok Figure 74-CL and Figure 74-SL Rigid Couplings for Mechanical Systems feature proprietary Sabertooth Installation Technology that allows you to SEE, FEEL and KNOW the coupling is installed properly;Sabertooth technology provides both visual and tactile installation confirmation while reducing installation effort and providing the fastest installation available. The Figure 74-CL features new CenterLOK gasket technology that features a center pipe-stop rib for quick and easy installation