YOUQI BZ5179F oil seal is a reliable sealing component manufactured in Shanghai, China. Designed for D‑4D engine oil pump and remote‑control off‑road racing differential mechanism, it fits dimension 21×35×7 mm with adjustable hardness ranging from 30‑90 Shore. Featuring excellent ozone resistance, corrosion resistance and superior electric insulation performance, this oil seal delivers stable sealing effect for cylinders, pipelines, automotive and aerospace sealing applications. Strict production craftsmanship guarantees long‑term service life under complex working conditions. Custom service is available to satisfy varied project demands. Products are wrapped with logo‑printed papers, inner cartons and outer cartons for anti‑collision protection during transit. We support OEM service and can provide samples upon request for your performance verification.