Freudenberg-NOK Sealing Technologies’ Duo Forseal is a new design for double-acting polytetrafluoroethylene (PTFE) U-Cups that are used on direct-injection automotive systems to seal the pump plunger driven by the camshaft. The universal properties of PTFE make U-cups highly resistant to all types of motor oils and fuels, but with the new Duo Forseal design, Freudenberg-NOK claims to provide an improved and better-performing injection plunger seal. Engines with gasoline direct injection are very efficient but require higher pressures between advanced injection pumps and their corresponding injection nozzles than traditional air-intake systems. The Duo Forseal makes an indirect contribution to emissions reduction because it is designed for the high pressure load. Additionally, its patented technology contributes directly to reduced emissions through lower leakage rates compared to traditional designs, claims the company.