Tedlar PVF Gas Sampling Bags with PTFE straight On/Off valve, 2L Back Catalog number: TDL31_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-T19PAH-2S PAH cold trap, UNITY 2/xr and TD-100/xr Price on request C-VAC-PIN Vacuum closure Pin Price on request