Style A—Style A have an alternating message. Wrap them around the pipe and you can read the contents whether the arrow points left or right.

Style B—Style B have a removable arrow; apply the message to a pipe and then turn the arrow to match your system’s flow direction. For a more secure hold, pair these with pipe marker tape—just layer the tape over the edge of your markers then wrap it around the full diameter of a pipe.

ASME A13.1—Pipe markers that meet ASME A13.1 adhere to requirements that, for a given pipe size, they have the proper minimum character height, identify contents with a message, indicate flow direction with an arrow, and designate hazardous classifications with a specific marker color. For messages with multiple marker color options, choose the color that best identifies the hazardous properties of the contents according to the ASME designations.

CGA C-9—Pipe markers that meet CGA-9 standards adhere to strict requirements for color and message uniformity to identify gas lines and equipment in medical and pharmaceutical industries.

NFPA 99—When placed according to NFPA 99 standards, pipe markers help you meet safety standards for medical gases in your facility.