Application : For Costco- Arcan dual pump plunger 3 or 3 1/4 Ton floor Jack. Application : For Costco- Arcan dual pump plunger 3 or 3 1/4 Ton floor Jack. Application : For Costco- Arcan dual pump plunger 3 or 3 1/4 Ton floor Jack. Function : Replacement Parts for floor Jack Repairs. Satisfaction Guarantee - If you're not 100% satisfied with our product, simply return it for a full refund in 30 days, guarantee with 12 month's warranty.