BLACK STEEL API LINE PIPE COUPLING
CERTIFIED BY THE AMERICAN PETROLEUM INSTITUTE
All of these Black Steel API Line Pipe Couplings are manufactured in accordance with American Petroleum Institute specifications 5L & 5B.
All sizes are taper tapped 3/4 inch per foot on the diameter. These couplings are phosphated and each end has a short, unthreaded space before the threads start. Use with SCH 80 nipples and SCH 160 nipples.