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 C-TAGKT TubeTAG starter kit (for SS tubes) Price on request U-T18325-2S EPA 325 cold trap, UNITY 2/xr and TD-100/xr Price on request C-HSPH HiSorb handle, for manual probe extraction Price on request