The 3M™ Flame Retardant Closures 4-type is a pressure tight, re-enterable closure suitable for enclosing spliced connections of communication cables in a wide variety of applications, including manholes. It is offered in various length and diameters.
All closures offer straight, branch and butt configurations. Standard Lengths range from 470 mm (18.50 inches) to over 2096 mm (82.50 inches) and closure diameters range from 77 mm (3.00 inches ) to 305 mm (12.00 inches).
Only tool required for installation is the washer cutter tool and torque wrench. The closure and endplates are molded from flame retardant material (UL 94 rated). To maintain air tight, water tight seal. “R” sealing tape is used for sealing the entire closure family.