KorKap PVC-coated galvanized rigid conduit and fittings provide unequaled corrosion protection. Manufactured in the U.S.A., ISO 9001-certified KorKap complies with all standards mandated by UL6, NEMA RN-1 and ANSI C80.1. Plus --- KorKap is ETL-Verified for product performance and reliable longevity ten or more times longer than brands that are not ETL-Verified. Look for the combined ETL/UL label to be sure you are receiving the protection you've paid for! PVC coated rigid metal conduit with gray urethane interior coating protects conductors from mechanical damage and corrosive attack. Electrical continuity is maintained across assembled joints. Physical Properties 40 mil gray PVC exterior coating 2 mil gray urethane interior coating Clear urethane coating over hot galvanized threads 12 trade sizes from 1/2" through 6" Shipped in 10' lengths Plastic thread protector caps are color coded for quick identification of conduit size. Thread Protector Cap Colors: Black- for 1/2" sizes, 1/2", 1-1/2", 2-1/2", 3-1/2" Red- for 1/4" sizes, 3/4", 1-1/4" Blue- for even sizes, 1", 2", 3", 4", 5", 6" Standards UL Listed, (Standard 6) with PVC as the primary corrosion protection for the steel conduit. The underlying zinc coating is a supplemental corrosion protection coating. Restricted for use with threaded fittings only. Corrosion protection properties of exterior zinc coating were not investigated.