Nashua 6-in x 50-ft Select Window and Door Flashing Tape is a 20-mil thick premium butyl rubber adhesive tape designed for high-performance sealing around windows and doors. This durable black flashing tape provides a permanent waterproof and airtight barrier that defends against wind-driven rain, air infiltration, mold, and mildew. It maintains excellent adhesion in extreme temperatures ranging from 20 to 180 degrees Fahrenheit and is compatible with most common building sealants and caulking materials

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