A connection assembly (100; 200), comprising: a tension element (145; 230) and an inner body (105; 205) having a first connection end configured to engage an adapter and a second connection end arranged opposite the first connection end and being configured to engage said tension element (145; 230); a retainer body (140; 225) configured to be engaged by the tension element (145; 230) when the tension element (145; 230) engages the second connection end , wherein the retainer body (140; 225) comprises a contact end and a gripping end arranged opposite the contact end , the gripping end being configured to be engaged and compressed by the tension element (145; 230) when the tension element (145; 230) engages the second connection end , thereby forcing the gripping end against at least one communication cable extending through the connection assembly (100; 200) such that the retainer body (140; 225) forms a grip with the at least one communication cable , and a sealing element (130; 215) arranged at least partially between the inner body (105; 205) and the tension element (145; 230), the sealing element (130; 215) being arranged around the at least one communication cable ; characterized by a compression element configured to engage the sealing element (130; 215) and being arranged at least partially between the sealing element (130; 215) and the tension element (145; 230), wherein the retainer body (140; 225) is configured to be forced by the tension element (145; 230) to move proximally towards the inner body (105; 205) so as to cause formation of a seal with the at least one communication cable . a tension element (145; 230) and an inner body (105; 205) having a first connection end configured to engage an adapter and a second connection end arranged opposite the first connection end and being configured to engage said tension element (145; 230); a retainer body (140; 225) configured to be engaged by the tension element (145; 230) when the tension element (145; 230) engages the second connection end , wherein the retainer body (140; 225) comprises a contact end and a gripping end arranged opposite the contact end , the gripping end being configured to be engaged and compressed by the tension element (145; 230) when the tension element (145; 230) engages the second connection end , thereby forcing the gripping end against at least one communication cable extending through the connection assembly (100; 200) such that the retainer body (140; 225) forms a grip with the at least one communication cable , and a sealing element (130; 215) arranged at least partially between the inner body (105; 205) and the tension element (145; 230), the sealing element (130; 215) being arranged around the at least one communication cable ; characterized by a compression element configured to engage the sealing element (130; 215) and being arranged at least partially between the sealing element (130; 215) and the tension element (145; 230), wherein the retainer body (140; 225) is configured to be forced by the tension element (145; 230) to move proximally towards the inner body (105; 205) so as to cause formation of a seal with the at least one communication cable . <EOS>