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YAB-C elliptical open atmospheric manhole
YAB Quick Opening Health Grade Manhole
YAE-L-S Square Health Grade Manhole
Elliptical opening
YAA Type Pressure-resistant Hygienic Manhole-0.3
YAA-B type pressure flange manhole
YAB-Z atmospheric manhole (common type)
YAD-N-W Hygienic Manhole with Mirror
Outside integral flange mirror manhole
Health-grade oval hole (two sections)
Square Manhole-Y Long Double Beam
Square manhole-short double crossbeam (two sections)