This 10piece pack features copper washers sized 5 x 12 x 2 mm, intended as solid gaskets for sump oil sealing applications. The washers are designed to provide a reliable seal in oil environments where a compact copper sealing washer is required. Each piece is crafted to help you achieve a tight, durable seal when assembling or reassembling components that use this size. Key benefits Reliable seal in oil environments: copper material compresses to fill small gaps, helping prevent leaks in sump and related seals. Compact, exact sizing: inner diameter 5 mm, outer diameter 12 mm, thickness 2 mm, designed for specific sealing needs. Durable and corrosion resistant: copper stands up to oil and typical engine fluids, supporting longterm sealing performance. Convenience of a 10piece pack: provides multiple washers for replacements or multiple connections without reordering. Key attributes Material: copper Size: 5 mm inner diameter, 12 mm outer diameter, 2 mm thickness Type: solid gasket / oil seal Pack quantity: 10 pieces per pack Intended use: sump oil sealing and related sealing applications that require copper washers Specifications alignment The product is a copper washer set designed as solid gaskets for sump oil seals, with 10 pieces per pack and dimensions 5 x 12 x 2 mm, suitable for applications needing this exact size. Applications and use cases Automotive sump oil seal: worn or damaged copper washers on oil sump seals or related connections to prevent oil leaks. Oil drain plug replacement: use for sealing connections that require a 5 x 12 x 2 mm copper washer to achieve a proper seal. Small engine or hydraulic systems: suitable for sealing fluid lines and joints in machinery that use this washer size, including gearboxes or auxiliary equipment. How to use Clean mating surfaces to remove oil, dirt, and debris before installation. Place the copper washer between the threaded connection and the mating surface. Tighten to the appropriate torque specification for the system (avoid overtightening to prevent deformation). If the washer is deformed or damaged upon disassembly, it with a washer from the pack. Care and notes Copper washers are typically used as singleuse seals; inspect and if deformed or damaged. Store in a clean, dry place to prevent oxidation or contamination prior to use. This description maintains a professional, clear tone and includes the product's key attributes, compatibility on the specified size, practical use cases, and straightforward usage guidance.