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 P-CP020 O-Rings, 23mm × 3mm i.d.,pk 20 Price on request M-SPC15-250 Collar spacer, alum 15mm, for M-CTE250I,pk 4 Price on request T-6EMP Empty cold trap, TT24-7 Price on request