Feature 1This automatic chlorinator is designed to be installed next to your filtration system. 2It is operated by the pressure difference of the system, and the system absorbs water through the feeder. 3The control panel is easy to use and allows you to adjust the dispense rate. 4By adjusting the valve setting between Perchlor and OFF, you can easily adjust the amount of chlorination to maintain proper chlorine residue in the pool. 5Made of high quality environmentally friendly plastic material, corrosion resistant, strong and durable.Item Type: Pool Chlorine Feeder Material: PlasticColor: As shown in the pictureProduct Assembly Size: Approx.42cm / 16.5inWeight: Approx. 1130g / 39.9ozOut Inner Diameter: 42mm / 1.65in female and male threadIN Inner Diameter: 42mm / 1.65in female and male threadApplication: Suitable for swimming pool, hot spring and spa .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }Package List1 x Pool Chlorine Feeder1 x Base Accessory1 x Instruction ManualNote1. Please allow 12in 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.