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Purple abrasive will not discolor the surface you are sanding
Ratcheting riser allows for easy and reliable fine-tuning arc adjustments after installation
tall w/2-inch hole center spacing's
UPC: 028893132035
cracks in concrete
Witten Vent 315CBL Foundation Vent, 62 sq-in Net Free Ventilating Area, Mesh Grill, Thermoplastic, Black Oxide Squares - Bevel Purple abrasive will not discolorWith 1 in W frame for new construction or to replace old foundation vents. Fits standard 8 in x 16 in concrete block opening. Operates automatically without electricity, opens at 70 deg F, closes at 40 (approximately). Simple homeowner DIYer snap in installation, with color matched set screws for additional stability. Removable back for maintenance and cleaning. Screened with 1 8 in heavy duty aluminum mesh. High density thermo plastic construction.
