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All metal valves(Steel, Aluminum or Stainless) for Fire Extinguishers as well as Sprinklers(Also Metals, Steel or Aluminum) can be replaced with Engineering Plastics(Acetyle, MC-900, Nylon Double Glass) with much lower production costs than metals and lighter weights without any problem in their existing installations. Engineering Plastics, including Polycarbonate, are now very popular in Car Industries and medical Appliances.[URL]http://plastic.flux.com[/URL]. Korea Fire Fighting Corporation patented "Nude Fire Extinguisher" with Polycarbonate Cylinder for Fire Extinguishers in the world in order to make cheaper and lighter than metal-clad extinguishers in the world.

http://www.yeright.com/videos/video/qExzEjMVzQo/

Polycarbonate(PC, Not Personal Computer), the typical Engineering Plastic has been used in our living lifes, from human baby feed bottle, drinking Sports Bottle and daily potable water container in Water Purifiers, Star Bucks Coffe Pots, Head Lights of Automobiles, Street Light Covers(Globe), Sign Boards in Gas Stations, Shops, Stores, Banks, and Lotteries, as well as Sunglasses and Helmet for Astraunaut of Spacemen, from Mr. Amstrong.Can you imagine that I, Zephyr Archangel replaced the Heaven's Main Entrance Gate with Polycarbonate, just before my birth as human being on June 2nd, 1950(Lunar Calendar) in Ugly Korea during Korean War in Seoul, South Korea.Now when you are going to fly to Heaven in some years, then you can not avoid encountering me, Zephyr Archangel, who keeps the Heaven's Main Entrance Gateas Gate Jockey.Have a good and amazing day!!! with Blesssing from Zephyr Archangel.....