Tedlar PVF Gas Sampling Bags with PTFE straight On/Off valve, 5L Back Catalog number: TDL31_5L Availability: In the manufacturer's stock Price on request - + Recommended U-COV450 O-Rings, low-emission,pk100 Price on request 1233 BALLOONS FOR GAS SAMPLING, 4Liters Price on request U-COV35 O-Ring, low-emission, size 035,pk10 Price on request