| 摘要 |
The invention relates to a removable and adaptable internal resilient cover for sealing against odours and gas leaks in manholes, wells and tanks, consisting of an resilient canvas with wide edges made of rubber or a similar material, mounted on an extendible light-weight metal structure having variable geometry, which allows the edges of said canvas to be adapted to the geometry of the inner shape of the manhole, well or tank, thereby sealing it, with the possibility of easily removing the seal and re-using it as many times as desired. |
