The Health and Safety (Safety Signs and Signals) Regulations 1996 require employers to mark visible pipes in the workplace which contain or transport dangerous substances. BS171 1984 Identification of Pipelines and Services, specifies the colours to be used for the identification of pipes containing or transporting dangerous substances, including conduits for electrical services and ventilation ducting
Pipeline ID flow markers are manufactured from high quality self adhesive vinyl
Each marker has a twin flow direction system so you can simply remove the direction which is not required

Self-Adhesive Vinyl: A high gloss, flexible PVC vinyl with self-adhesive backing. Suitable for applying to most smooth, dry and clean surfaces. Ideally suited for internal signs.