Air tightness maintenance: The piston ring provides a reliable seal between the piston and cylinder wall, effectively maintaining air tightness during operation. Convenient installation: The piston ring features standard inner and outer diameter sizes, allowing for easy installation and disassembly, providing convenience for maintenance. Sturdy and secure: Made from durable materials, the piston ring resists casting defects such as cracks, pores, and looseness, delivering a tight and secure connection for performance. Multiple replacement rings: Each kit includes 3 or 4 replacement piston rings for the air pump, helping to prolong its lifespan. Use scenarios Household air pumps and small compressors: Use these replacement rings to maintain seal and efficiency during regular inflating tasks (tires, sports equipment, air mattresses) or powering small pneumatic tools. Automotive or workshop maintenance: Keep a spare kit on hand to worn rings in pistontype air pumps and compressors, reducing downtime and preserving performance. DIY projects and spare parts: Suitable for DIY air pump builds or repairs, ensuring a quick, reliable seal replacement to extend component life.