A single-acting rod seal, Trelleborg Zurcon® L-Cup® is an alternative to the U-Cup. It is a highly effective sealing system offering optimized sealing performance and extended service life. With exceptionally low friction properties, it has high wear resistance, back pumping ability along with high static and dynamic tightness.--Zurcon® L-Cup® is a single acting polyurethane rod seal with a unique design offering a hydrodynamic backpumping ability over the complete working pressure range.