Filter Cap for 5mL Dionex® Vial, 250pk: K4250: 5mL Vial and Cap without Filter for Dionex® IC, 250pk: K4270: 0.5mL Vial and Filter Cap for Dionex® AS40, 250pk: K4280: 0.5mL Vial and Cap W/out Filter for Dionex® AS40, 250p: K4300: 7mL Vial with Pierce Cap