One-Button Hydraulic Toilet Seat Soft Close Damper Adjustable Universal Hinges Fittings Silicone Oil Rotary Damper. 20+ Years Experience: Leading manufacturer specialized in rotary dampers and toilet seat hinges since 1992. 50,000 Cycles Lifespan: Dampers designed for durability with a lifecycle reaching up to 50,000 operations. Premium Japanese Oil: Uses imported Shinetsu damping oil from Japan for stable performance and long life. Full OEM Solutions: Provides complete OEM services including design, prototyping, tooling, and production. 100% Torque Inspection: Every unit undergoes 100% torque inspection before shipment to ensure quality. Universal Fitment: Adjustable universal hinges with standard size range of 16-30cm for versatile installation. Free Samples Available: Free samples offered for testing, though delivery fees may apply.