Abstract: A marker system for pipes or valves comprises a tape having a surface layer and a pressure sensitive adhesive layer, the tape defining spaced-apart transparent window areas. A release paper backing is deployed on the adhesive layer of the tape, and the release paper backing includes pre-cut window backing portions generally registered with the transparent window areas of the tape. The pre-cut window backing portions may be joined with the release paper backing along a hinge/tear line whereby the window backing portions may be folded away from the tape. The marker system further comprises information cards sized to be adhered in the transparent window areas of the tape. The marker system is installed by first removing or folding back the pre-cut window backing portions of the release paper backing and adhering the information cards in the window area.