Feature: 1. This automatic chlorinator is designed to be installed next to your filtration system. 2. It is operated by the pressure difference of the system, and the system absorbs water through the feeder. 3. The control panel is easy to use and allows you to adjust the dispense rate. 4. By adjusting the valve setting between Perchlor and OFF, you can easily adjust the amount of chlorination to maintain proper chlorine residue in the pool. 5. Made of high quality environmentally friendly plastic material, corrosion resistant, strong and durable. Specification: Item Type: Pool Chlorine Feeder Material: Plastic Color: As shown in the picture Product Assembly Size: Approx.42cm / 16.5in Weight: Approx. 1130g / 39.9oz Out Inner Diameter: 42mm / 1.65in female and male thread IN Inner Diameter: 42mm / 1.65in female and male thread Application: Suitable for swimming pool, hot spring and spa . Package List: 1 x Pool Chlorine Feeder 1 x Base Accessory1 x Instruction Manual Note: 1. Please allow 1‑2in error due to manual measurement. Thanks for your understanding.2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.3.Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.