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Zurcon® Scraper WNV is a double-acting scraper. Its dynamic scraping
lip is specially designed with an additional inward sealing edge to keep
the residual oil film in the system. If the volume of this oil film can not be
back pumped by the main rod seal, a pressure build-up will be prevented
by lifting the scraper lip to reduce pressure. The static sealing lip and
edge ensure against ingress of dirt and fluids.