ZHE (Zero Head Space Extractor) hazardous waste filtration system, which is approved by the US Environmental Protection Agency (EPA) as an apparatus for Toxicity Characteristic Leaching Procedure (TCLP) measurement. The system cannot pressurise unless completely assembled; this eliminates accidentally 'shooting the piston' out of the unit and assures safe operation. Choose both manual and automatic venting modes.

• Allows for pressursation of filter without introducing air, due to movable piston design
• Prevents loss of volatiles
• Manual and automatic venting modes
• System cannot be pressurised unless completely assembled, thereby preventing 'shooting the piston' out of the unit accidentally