PVC Pump Tube 3tag, 72mm spacing, 0.57mm ID White/Yellow (PKT 12).Tag Colors: White/YellowID mm: 0.57Wall Thickness mm: 0.91OD mm: 2.39Overall Length: 455mm (72mm spacing between tags)Number of Tubes Per Pack: 12Physical Properties: Thermoplastic, PVC based material with plasticizerMaterial: Made from Tygon R3603/R3607 or equivalent.Special Properties: Inexpensive all-around tubing for general laboratory applicationsChemical Compatibility: Excellent for aqueous solutions of the following acids and concentrations, up to 35% Nitric Acid, up to 37% Hydrochloric Acid, up to 25% Hydrofluoric Acid, up to 30% Hydrogen Peroxide.Limitations: Potential leaching of plasticizersGlass Expansion is ISO 9001:2015 certified by AB Certification, No. AU4501-9001