Feature:1. EXCELLENT MATERIALS: The mechanical seal is made of ti tungsten material, which has high hardness and corrosion resistance.2. SEAL RING AND SPRING: The sealing ring is used in conjunction with the spring to make the water pump safe and continuous operation.3. COMPACT STRUCTURE: The overall structure is compact, small in size and low in noise, with good energy saving effect.4. GOOD PROTECTION: Automatic protection for pump water and electricity leakage, overload and over temperature, with good reliability.5. REPLACEMENT PARTS: The mechanical seal of the pipeline circulating water pump can directly replace the old or broken parts.Specification:Item Type: Mechanical SealModel: 520-5/8Material: Silicon Carbide + Ti Tungsten.Package List:2 x Sealing Rings1 x Spring