TEL：0577-86810638
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 99I001-elliptical manhole
99I002-elliptical manhole cover (pressure)
99I003-elliptical manhole cover
99I004-pressure manhole + sight glass
99I005-round manhole
99I006-round manhole cover (non-pressure type)
99I007-round manhole cover (pressure type)
99I008-Rectangular manhole cover (pressure type)
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