CP 617 Firestop Putty Pad - Firestop Putties - Hilti USA
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Amazon.com: 3M Fire Barrier Moldable Putty Pads MPP+ - Shapeable Firestop Pads for Wall Openings and Through Penetrations - 7" x 7", 20/case - Red : Health & Household
Correct installation of Hilti CP 617 Firestop Putty Pads for electrical boxes - YouTube
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Amazon.com: 3M Fire Barrier Moldable Putty Pads MPP+ - Shapeable Firestop Pads for Wall Openings and Through Penetrations - 9 1/2" x 9 1/2", 20/case - Red : Health & Household