SMSKu-E-H0 is a plastic push-in sleeve made of special plastic, in grey (RAL 7035), non-flame propagating, halogen-free. This push-in sleeve is used for the plastic straight pipes FPKu-EM-F-LS0H Low Smoke and FPKu-EM-F-H0 as well as for all halogen-free corrugated pipes. The advantage is that it is halogen-free, as this means that no dangerous toxic and corrosive gases are produced.0605 DIN EN 61386-21 100% halogen-free according to DINV 0604-2-100