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Roof Safety Markers is your solution for hard to attach to vents with caps. Roof Safety Markers L-Style Clamp will easily attach to the hood of the vent without screwing into the material. Simply squeeze the clamp and attach to the outer rim of the vent. If the hood is able to accept screws our Universal Bracket can be used as well. Clearly marks and identifies the vents with caps.
4' Fiberglass Safety Marker with Reflective Tape.