8am-4pm Pacific Mon-Fri | 208-413-6377

U-Cups Loaded - PolyPaks ®

High Performance Loaded U-Cup Seal 

The O-Ring loaded U-cup is a single direction piston seal, meaning it can only seal if the pressure is coming from one direction. Since the sealing method is single directional, two loaded U-cups must be installed for dual direction hydraulic piston applications.

The lip designed is a straight lip design, so the loaded U-cup has good seal ability but also proves to be excellent at contamination removal away from the sealing lip. Overall, the shape of the loaded U-cup is a large rectangle that greatly adds to the stability of the seal. Also like most polyurethane seals, the loaded U-cup features an O-Ring energizer, which is designed to activate the seal at lower pressures.

We started as a simple online company taking care of a precious few people. Our circle of business friends has grown over the years and taking care of them is more satisfying than ever. We take care of our customers' Standard O-Rings, Metric O-Rings, Vulcanized O-Rings, and Custom O-Rings. Just place your O-Ring order online and we will take care of you too.

We are a family owned and operated Distributor and Manufacturer of O-Rings, O-Ring Kits, OSK™ O-Ring Service Kits, Hydraulic Seals, Adhesives, Lubricants, Braided Packings, Coatings, O-Ring Cord, Lathe Cut, Oil and Shaft Seals, Gaskets, Retaining Rings, Molded Packings, Seals, and Molded Rubber Products.

We serve many industries, including manufacturing, chemical processing, defense, power generation, agricultural, water treatment and filtration, hydraulics, fluid power, heavy truck, automotive, aerospace, oil and gas, medical and life sciences, food and beverage, electronics and industrial controls, refineries, and supply chain suppliers. Each industry and each customer have unique requirements that make them special. We love sharing customer stories and applications at our weekly store meeting.