| 摘要 |
<p>A seal member (10) for sealing the base of an access chamber (30) to the neck region of an underground storage tank (40) comprises first and second edge portions (2, 4) for connecting to the tank neck region and the base of the access chamber, respectively, as well as a series of pairs of diametrically opposed short, upstanding collars (6, 8, 12) which are initially blanked off, and opened as necessary to allow passage therethrough and sealing of certain pipes from the tank system.</p> |
