Herein an assembly (1)is disclosed configured to provide access to an interior volume (3, 3') of a breathing conduit (5, 6). The assembly (1) comprises a piercing portion (9) and a body portion (10). The piercing portion (9) is configured to pierce through a wall (11, 11') of the breathing conduit (5, 6) to make an opening (13, 13') there through. The piercing portion (9) is configured to be inserted through the opening (13, 13'), into the interior volume (3, 3'). The body portion (10) comprises a channel (15, 15') configured to provide fluid access to the interior volume (3, 3'). The assembly (1) comprises a sealing (17) configured to seal an area between the opening (13, 13') and the body portion (10). The present disclosure further relates to breathing conduit kit(2)comprising breathing conduit (5, 6) and an assembly (1).
