衛生級壓力視鏡人孔 Pressure glass Manhole
衛生級主大梁人孔 衛生級無(wú)壓力人孔 Sanitary no pressure manhole
衛生級外開(kāi)式常壓人孔 Manhole
衛生級推進(jìn)式橢圓形人孔 Sanitary oval manhole
衛生級密封式手孔人孔 Manhole
衛生級固定式人孔Manhole
橢圓人孔 Manhole
人孔視鏡 Manhole glass sight
方形人孔 Square manhole
常壓人孔
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