Hydraulic seal can be dynamic or static. The products range includes Piston Seals,, Rod Seals, Wiper Seals, Wear Rings, Back-up Rings, Oil Seals, Vee-Packings and Hydraulic Redress Kits. They are widely used in construction, machinery, injection machines, die-casting machine, vulcanizing machine and other industries. https://globalsealstech.com/hydraulic-seals/