Attributes . Specially Colored conduit that is used for quick identification of circuits. The 3/8" through 1-1/4" trade sizes are Square Lock formed and include a bonding strip of copper that is enclosed within the convolutions throughout their entire length. The 1-1/2" through 4" trade sizes are designed with a fully interlocked strip. The Liquid Tight jacketing material which resists oils, mild acids and exposure to sunlight. . Names