CC Series Flange Covers CC Series flange covers prevent damage during maintenance, repair or new construction in standard and low profile sheet metal or machined flanges. A A Material: Low-Density Polyethylene Color: Yellow C B A FN Series Finishing Flanges - Non-Corroding FN Series flanges (non-corroding) provide a durable and long-lasting appearance as well as an economical alternative to metal flanges. Material: Linear Low-Density Polyethylene Color: White D A C 384 * For other material and color options, contact customer service.