Generic 1/8" ID 1/4" OD Clear PVC Vinyl Dosing Tubing (by the Foot) $0.25 Dosing tubing perfect for replacing old worn out tubing for dosing aquarium additives. Outside Diameter: 1/4" Inside Diameter: 1/8" Hardness: 67 durometer 1/8" ID x 1/4" OD x 1/16" Wall PVC tubing is manufactured to exact... Add t