Polyester gas sampling bag with PTFE dual-valve, 2L Back Catalog number: HEDPOL32_2L Availability: In the manufacturer's stock Price on request - + Recommended U-T9TNX-2S Unity 2/TD-100 Cold trap, Tenax TA Price on request U-COV108-L O-ring, Injector Liner, Brown, Low Temp, pk 10 Price on request U-T7EMP-2S Empty cold trap for UNITY series 2 Price on request