B-915 Snap-On Pipe Marker Coiled Printed Plastic Sheet 41810 / 4023-B white arrows and legend: "CHILLED WATER RETURN" on green marker size B Outside pipe diameter is 1-1/2"- 2-3/8". Brady B-915 Brady snap-on pipe marker is cylindrically coiled printed plastic sheet. Pipe markers are ideal for indoor or outdoor use and may be applied to dirty, oily, greasy or rough surfaces. Standard material colors are red, green, blue, white and yellow (ANSI A13.1). Standard legend colors are black and white. Average outdoor durability is 5-8 years (Average expected outdoor life of product will depend on user definition of failure and climatic conditions). Gloss is 40 gardner units. 3/4" Character height.