Abstract: An adjustable marking device for visual identification of a valve in a valve housing or a pipe comprises a substantially planar flexible body having a tail, a head, and a visual indicator. A permanent magnet is secured to the body for magnetic attachment to the housing or pipe. A fixing means holds the tail and the head when they are brought into overlapping proximity with one another to form an in use configuration to fit the housing or pipe. The visual indicator may be a color indicator and/or a directional indicator. A method is provided for visually identifying a valve in a valve housing or a pipe in a multi-valve distribution and/or treatment system by means of a color indicator and directional indicator of valve operation.

Abstract: An adjustable marking device for visual identification of a valve in a valve housing or a pipe comprises a substantially planar flexible body having a tail, a head, and a visual indicator. A permanent magnet is secured to the body for magnetic attachment to the housing or pipe. A fixing means holds the tail and the head when they are brought into overlapping proximity with one another to form an in use configuration to fit the housing or pipe. The visual indicator may be a colour indicator and/or a directional indicator. A method is provided for visually identifying a valve in a valve housing or a pipe in a multi-valve distribution and/or treatment system by means of a colour indicator and directional indicator of valve operation.