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Triple anti-noise patent technology. The first patent : Put a rubber cushion between manhole cover and frame. The second patent : Make the manhole cover and frame more tighter and matched. The third patent : Set a elastic device at the back of manhole cover, in order to avoid manhole cover to deform.

We need waterproof manhole cover for heavy duty (D400) for petrol station. Clear opening must be at least 750x750mm or bigger. For start we need 8 pcs