Cast-in-place through-penetration firestop device

A cast-in pass-through firestop device, comprising:

• a hollow tubular body, wherein the hollow tubular body comprises a first tubular body part and a second tubular body part, the first tubular body part overlapping with the second tubular body part along a principal axis;
• a bayonet locking mechanism for adjusting overlap of the first tubular body part and the second tubular body part, wherein the bayonet locking mechanism comprises:
• a key pin radially projecting from the first tubular body part,
• a key passage radially recessed in the second tubular body part, and
• the key pin being radially engaged with the key passage, wherein the key passage comprises at least two first sections being arranged in different planes which are perpendicular to the principal axis, and a second section arranged at least partly in parallel to the principal axis and connecting the at least two first sections, and
• a sealing ring, wherein the sealing ring is mounted rotatably on the first tubular body part and comprises a radially projecting sealing ridge engaged with the second section of the key passage, and
• an inlay made of an intumescent firestop material arranged within the hollow tubular body.