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 NDV31_50L New Devex Sampling Bag with PTFE Valve & Septum Fitting, 50L Price on request M-MCHOR O-Ring, micro-chamber pan seal, for M-CTE120I,pk 6 Price on request U-T19PAH-2S PAH cold trap, UNITY 2/xr and TD-100/xr Price on request