BTru-Flate 21-555 18'' Drain Cock ReviewbP PP Tru-Flate 21-555 18'' Drain Cock PAll brass, corrosion resistant materialPComplete line of pipe couplings, thread adapters and bushingsPAllows user to adjust thread sizes from 18 inch NPT through 12 inch NPT with either male or female endsP18 inch drain cockP