80Piece Rubber Dust Cap Assortment Six sizes included: 5/32 x 20, 3/16 x 20, 7/32 x 20, 1/4 x 10, 5/16 x 5, and 3/8 x 5 pieces. Each cap is individually bagged and labeled for quick identification. resistance material: Made from flexible rubber that preserves integrity under heat exposure, providing reliable insulation for automotive and industrial applications. Secure vacuum leak protection: Elastic rubber construction creates tight seals on carburetor ports, manifold fittings, and hose connections, effectively helping to avoid pressure loss in various systems. Multipurpose automotive and industrial use: Suitable for blocking off unused vacuum ports on carburetors, fuel systems, and manifolds, with general use on pipelines and hydraulic connections in industrial settings. Benefits and practicality: Durable, heatresistant caps that fit common vacuum ports and fittings, organized in labeled bags for fast selection, and designed to prevent dust ingress and leaks during maintenance or testing. Practical use scenarios: During carburetor work, seal unused vacuum ports to prevent dirt entry and vacuum leaks. For system testing or maintenance, cap off specific vacuum lines or manifold ports to isolate sections. In industrial settings, block off unused hydraulic or pneumatic lines to prevent contamination and leaks during assembly or service.