Sealing system for sealing around cables, wires or pipes extending through a partition wall, said system comprising: a frame intended to be arranged in the partition wall: a plurality of insert blocks , each formed by two insert halves, wherein each insert half comprises: a body with a first end and a second end , a first side intended to be arranged towards a corresponding first side of a substantially identical insert half, forming an insert block , and a groove arranged in said first side and extending between the first and second end along an axis A, and wherein the body comprises a fluid permeable layer extending in a plane transverse to the longitudinal direction of the axis A, wherein said two insert halves are arranged with their respective groove facing each other such that a passage intended for a cable, wire or pipe is formed, and said plurality of insert blocks to be fitted around the cables, wires or pipes are arranged within the frame such that a fluid communication system is formed by the fluid permeable layers of the plurality of insert blocks; wherein the system further comprises a pressure applying device arranged within the frame to apply a pressure on the plurality of insert blocks within the frame to seal the space within the frame between the plurality of insert blocks and the pressure applying device; and a device intended to be connected to a supply of pressurized fluid and direct the pressurized fluid to the communication system formed by the permeable layers of the plurality of insert blocks, and wherein the sealing system comprises the supply of pressurised fluid and a gauge showing pressure loss a frame intended to be arranged in the partition wall: a plurality of insert blocks , each formed by two insert halves, wherein each insert half comprises: a body with a first end and a second end , a first side intended to be arranged towards a corresponding first side of a substantially identical insert half, forming an insert block , and a groove arranged in said first side and extending between the first and second end along an axis A, and wherein the body comprises a fluid permeable layer extending in a plane transverse to the longitudinal direction of the axis A, wherein a body with a first end and a second end , a first side intended to be arranged towards a corresponding first side of a substantially identical insert half, forming an insert block , and a groove arranged in said first side and extending between the first and second end along an axis A, and wherein the body comprises a fluid permeable layer extending in a plane transverse to the longitudinal direction of the axis A, wherein said two insert halves are arranged with their respective groove facing each other such that a passage intended for a cable, wire or pipe is formed, and said plurality of insert blocks to be fitted around the cables, wires or pipes are arranged within the frame such that a fluid communication system is formed by the fluid permeable layers of the plurality of insert blocks; a pressure applying device arranged within the frame to apply a pressure on the plurality of insert blocks within the frame to seal the space within the frame between the plurality of insert blocks and the pressure applying device; and a device intended to be connected to a supply of pressurized fluid and direct the pressurized fluid to the communication system formed by the permeable layers of the plurality of insert blocks, and wherein the sealing system comprises the supply of pressurised fluid and a gauge showing pressure loss <EOS>