aperture and a second on the conduit connected by a flexible conical section which provides compliance to both axial and angular movement of the conduit an inner supporting ring of rigid material is used to force and maintain the first seal in compression sealing relationship irrespective of roundness variations within the aperture and a screw tightened band is used to retain the second seal in a compression sealing relationship about the conduit application_number US 22490494 A description considering the difficult installation conditions in underground distribution systems and the growing emphasis on spill containment the actual method of installing sump seals can be as important a consideration as their mechanical design so that the present invention will be structurally described along with reference to a method and means of installation since the relatively adverse conditions under which spill containment installations must be made cannot be appreciably changed it remains for the structures and operating methods to be changed to be less sensitive to unpredictable deviations in layout or dimensions and to reduce the assembly process to lower skill levels without affecting a quality result to begin the description of how the present invention achieves this end reference is made to fig1 which shows a typical underground spill containment system for a gasoline station a fuel tank 1 is located in a deep excavation 2 which is usually filled with pea gravel 37 to avoid using soil for backfill that can pack or settle with time.