Topaz’s Rigid Bushings with Insulated Thermoplastic Liner offer maximum protection for cables to avoid damaging abrasion due to sharp Rigid conduit edges. Ideal for use in communications, television and security system installations. Insulation offers maximum protection against abrasion; thermoplastic liner certified flame retardant to 105°C. Strong malleable iron construction and easy to install design. UL listed and available in sizes from 1/2” to 6”.