A marine installation comprising a marine structure with one or more legs, a device for securing a connection to be formed between said one more legs and a pile of a fundament fastened in a seabed, wherein the connection comprising the leg partly inserted into an opening of the pile, wherein the device is configured to be firmly connected to said one or more legs, the device comprising a sleeve element configured, together with the leg of the marine structure, to be brought to vicinity of an upper portion of the pile, and a clamping arrangement attached to the sleeve element comprising at least one clamping device configured to form an attachment between the sleeve element and the upper portion of the pile attached to said one or more legs of the structure and a pile of a fundament fastened in a seabed, wherein the clamping device has formed an attachment between the sleeve element and the top portion of the pile.