Features: 1. Application: For Costco- Arcan dual pump plunger 3 or 3 1/4 Ton floor Jack. Replace Part Number: 214739. 2. Function: Seal kits prevent floor jack leaks, prevent the intrusion of outside air, dust, dirt and foreign matter; greatly enhance the contact force between the piston rod and the bolt. Replace the seal kit to get your floor jack pump back in working order. 3. Features: Various types of sealing kits are available for selection, which is convenient for installation. 4. High Quality: Made from high standard rubber, Durable. .