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Premium Quality Heavy Duty SMC Manhole Cover 600mm Round C250 Watertight Lockable SMC Manhole Cover. 100% Waterproof Design: Features unique rubber hollow design with EPDM material and double sealing rings. Long Service Life: Designed for over 25 years of service life with durable construction. UV Resistance: Exclusive recipe ensures no fading for more than 3 years. Lightweight Composite: Optimized structural design and material composition for easy handling. Anti-slip Surface: Safety-focused surface design prevents slipping in various conditions. Durable Lifting Hole: Made of aluminum alloy for easy installation and long-term durability. OEM and ODM Accepted: Flexible customization options available for specific needs.