Piston Seal SPGO Application Range This is a standard combination seal for a wide range of applications. Has the same performance as SPG. Standard Material Seal: Filled with polytetrafluoroethylene F-PTFE O Ring: NBR or FKM Feature The sliding material is filled with polytetrafluoroethylene, which has a low frictional resistance, eliminates creep and ensures high wear resistance. Since the single seal has a two-way sealing capability, the installation space is eliminated.