FeaturesDesigned for use with 3M™ fire barrier cast-in devices for fire stopping through penetrationsAdds up to 4 in (101.6 mm) to height of device for deeper concrete poursEasy snap-on assembly saves time and requires no fastenersFor special applications, adaptors can be modified to accommodate deeper concrete poursWhen used in conjunction with fire barrier cast-in devicesHeight adaptors are firestop tested for up to 3 hr in accordance with ASTM E 814 (UL 1479)