The Environmental Express zero head space extractor, ZHE+, is the finest device of its type available. Constructed of type 316 stainless steel, the ZHE+ has a capacity of 560mL, more than enough to utilize the maximum test sample of 25 grams as allowed by federal regulations. In use, the piston is moved up the honed sample barrel by gas pressure. This pushes the extracted sample through a 0.7µm borosilicate glass fiber filter, held between two photo-etched screens, out the top of the apparatus into a gas tight syringe or Tedlar* bag. A pressure gauge continually monitors filtration pressure. Pressurizing gas is introduced through a quick-connect fitting located on the bottom of the ZHE+, allowing the user one-hand operation when connecting or disconnecting the gas source. A pressure relief valve is also located on the bottom of the ZHE+. All fittings are contained within the "footprint" of the apparatus, protecting them from damage when the apparatus is handled or loaded into a rotary agitator. The finished extract exits through a 316 stainless steel plug valve located on the top plate. A plug valve is especially well suited for this application as it can be "throttled" to allow the pressurized extract to escape from the ZHE+ slowly. Top and bottom plates are connected by hex connecting rods and feet. The ZHE+ comes fully assembled. The ZHE+ is supplied with a complete set of spare O-rings and a polyethylene tool to remove the piston from the sample cylinder.

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