Ammonia Pipe Markers meet specification compliances for ANSI / ASME A13.1 standards for the identification of ammonia pipes. Ammonia Pipe Markers are available in wrap-around and strap-on formats for pipe outside diameters ranging from 3/4 inch to over ten inches and provide 360 degree visibility. 2 nylon ties are included with all markers for pipes with an outside diameter of 6-1/8" and larger so they can be easily affixed to the pipe.