Frame for shutoff devices of gas and water pipelines in paved and cladded traffic areas, is made of cast iron or plastic, and comprises lockable cover, which is fixed corresponding to height of adjacent pavement
摘要
<p>The frame is made of cast iron or plastic, and comprises a lockable cover, which is fixed corresponding to the height of the adjacent pavement. The frame is variably fixed in the horizontal grid dimension of the corresponding adjacent concrete pavement or concrete slab pavement.</p>
