Security Marker Adjustable Long Plastic Valve Seal The Acme Valve Seals are special purpose variable length seals designed for use on Oil and LPG gas cylinders or valves. Product Specifics MARKING: Laser or Foil marking Consecutively numbered as standard Optional Customer name/logoMATERIAL: Body – Polypropylene with Biodegradable additives/Insert – Acetyl with Biodegradable additivesAPPLICATIONS: Oil and Gas Valves, Cylinders Back