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FRP GRP Sewer Cover SMC Composite Manhole Cover. D400 Load Capacity: Meets EN124 D400 standard for heavy-duty road safety systems. Anti-Theft Design: Zero recovery value material prevents theft and ensures safety. 30+ Year Service Life: Durable SMC composite material ensures long-term performance. Full Customization Support: OEM services support any surface design or logo customization. ISO and CE Certified: Passed SGS and UKAS testing with full international certification. 1-Year Warranty: Comprehensive warranty coverage for peace of mind. Online Technical Support: Professional after-sales service team available for assistance. Lightweight & Strong: 34kg weight with 600mm clear opening for easy handling.