Features: 1/4 inch outer diameter tubing compatible with most reverse osmosis systems. Easy push-to-connect and disconnect design requires no tools. Made from food-grade plastic material, safe and healthy for drinking water applications. Helps optimize RO water production and reduces wastewater. Suitable for use in both cold and hot water systems. Ideal for RO system water distribution, refrigerators, ice makers, coffee machines, and beverage dispensers. Specifications: Material: Plastic Style: 150cc, 300cc, 450cc, 600cc, 1000cc Single Size: Approximately 6.6 x 1.7 cm (2.60 x 0.67 inches) Inner Diameter: Approximately 6.4 mm (0.25 inches) Package Includes: 1 x Flow Restrictor Note: Please allow 1-2 cm measurement variation due to manual measurement. Ensure you are comfortable with this before ordering. Due to differences in monitor displays, the actual color of the item may vary from the picture.