Trim-Tex Vinyl 3-Way Cap Adapters, 3/4" A rust-proof dent resistant PVC molded corner piece used to finish corners where multiple corner beads meet. Benefits: Does not contain cellulose, a food source for mold. Achieves Class A rating for flame spread as per ASTM E84 standards. Self-extinguishing when source of flame is removed. Can be used with Trim-Tex 847 Spray Adhesive. Trim-Tex Vinyl Corner Bead products are designed for interior use.