SpecSeal® SSB Firestop Pillows are highly adaptable intumescent firestop pillows engineered to compress easily and conform around virtually any penetrant. Designed for maximum versatility, SSB Firestop Pillows are ideal for both new installations and retrofit applications, making them a fast, reliable solution for even the most complex through‑penetration firestop conditions. Their compressible construction allows installers to pack and stack pillows tightly within openings, creating a durable, re‑enterable firestop seal that expands under fire exposure to block the spread of smoke, flame, and hot gases. Perfect for environments requiring frequent cable changes or where re‑entry is expected, SpecSeal SSB Firestop Pillows deliver code‑compliant performance with exceptional ease of use.