The Metacaulk Intumescent Sleeve from Rectorseal is a firestop smoke seal (when used with Metacaulk sealant) for PVC, cc-PVC, CPVC, FRPP, PP, ABS and PVDF pipe and rigid nonmetallic conduit installations. It easily wraps around pipes without modifications, steel bolts or fasteners, is manufactured of durable galvanized steel shell and lined with highly intumescent material, and is an ideal approach for firestopping combustible pipes penetrating the uneven contours of a concrete fluted deck assembly, or pipes that penetrate walls at less than a 90º angle.