The pipeline identification markers are manufactured from high quality self adhesive vinyl. Each has a a twin flow direction system so you can simply remove the direction which is not required and use the other to indicate the direction of flow inside the pipe.
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. The specific colour band of the marker identifies the pipe content following the British Standards BS 1710:1984 Identification of Pipelines and Services.