Three Dynetek carbon fiber CNG (compressed natural gas) storage tanks. Selling for $100 each or $250 for all three. These came off a CNG system. I do not know the manufacture date or whether they're still within their certified service life, so I'm selling them as-is. Buyer is responsible for determining suitability for their intended use. Tanks appear to be in good physical condition and still have the fittings/valves shown in the photos.