Amazon.com: Compatible Replacement Tube by CardioTubes fits Littmann(r) Classic II SE(r) Standard Stethoscopes - 5mm Black on Black Tubing : Industrial & Scientific
Amazon.com: Replacement Tube by CardioTubes fits Littmann Master Cardiology and Cardiology III Stethoscopes - 7mm Binaurals Dark Green TUBING : Industrial & Scientific
NEW STETHOSCOPE TUBING by Reliance Medical FITS LITTMANN® SELECT® 12 COLORS | eBay
3M Littmann Lightweight II S.E. Stethoscopes, Caribbean Blue Tube, 28 inch - Walmart.com