O-Rings, 23mm × 3mm i.d.,pk 20 Back Catalog number: P-CP020 Manufacturer: MARKES INTERNATIONAL LIMITED Availability: In the manufacturer's stock Price on request - + Recommended TDL71_5L Tedlar PVF Gas Sampling Bag with PP valve, 5L, 3/16'' OD (4.76mm) Price on request SERZ-1070 Spare bag sampling accessory, ACTI-VOC Price on request RMK-0027 Routine Maintenance kit, tube based systems, no co Price on request