The Swiss sales company of the Rapperswil-Jona sanitary group, holding two live VKF recognitions in Untergruppe 223 Abschottungen/Durchführungen — 27670 and 32066 — for firestop collars and sleeves matched to its own drainage pipework. That pairing matters in practice: a plastic waste stack is one of the most common compartment penetrations, and the seal is approved against the specific pipe system rather than generically.