Check the listing for details. Hobart Plasma Cutter Retaining Cup, Swirl And O Ring. Condition: New. Listed at 25.99 USD. The Hobart Plasma Cutter Retaining Cup, Swirl, and O Ring is a high-quality accessory designed specifically for Hobart plasma cutters. These components are essential for maintaining proper function and performance of the plasma cutter, ensuring precise and clean cuts. The brand's reputation for producing durable and reliable welding equipment makes this retaining cup set a trusted choice for professionals in the welding and metalworking industry.