Home / Manhole Covers / Heavy Duty Surface Box With Hinges Heavy Duty Surface Box With Hinges Heavy Duty Rectangular Surface Box that comes with hinges. Marking: JANS Material: Ductile Iron Size: 26″ X 20″ X 4″ Download Catalogue KBSB – Manhole Cover Series Related products 18″ X 24″ Manhole Cover (Light Duty) Ductile Iron Telecom Manhole Cover 7E TEM Square Frame Heavy Duty Manhole Cover (KUMBAHAN) 18″ X 24″ PE Manhole Cover TS Square Frame Heavy Duty Manhole Cover (DBKK) KGL-C Square Frame Medium Duty Manhole Cover (KUMBAHAN)