Nashua 557 PRO-GRADE is UL code approved for sealing class 1 flexible (181B-FX) duct joints and connections. With a polyethylene-coated cloth backing printed for easy inspection and a durable rubber adhesive, Nashua 557 is the ideal choice for sealing flexible duct work, dryer vents, and for heavy-duty household repairs. Nashua Trusted Tapes get the job done right, the first time, every time.
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