All devices can tightly be folded and are low of weight. Even the big devices of the type 1-2200 fit well into each common manhole between 600 and 630mm. This makes the work more simple, faster and thus more efficient. LAMPE-sewer sealing cushions shut all profiles, also egg, kite and mouth profiles and rectangular channels. Even pressure tests in special profiles with dry-weather ditch can be performed without any problem a expanding. Purchasing of special-formed rubber pipe plugs and sewer plugs will not longer be necessary.