Multi-layer gas sampling bags, PP valve (4.76mm), 1L Back Catalog number: HEDMBT71_1L Availability: In the manufacturer's stock Price on request - + Recommended U-COV35 O-Ring, low-emission, size 035,pk10 Price on request SERZ-1076 Spare filter assembly, ACTI-VOC Price on request HEDPOL32_5L Polyester gas sampling bag with PTFE dual-valve, 5L Price on request