A strong sense of responsibility motivates us to regard product optimization as our top priority and place great emphasis on customer .If you're a new buyer and want to create , Note about Adjustment Knob: Special Reminder:Please read the red instructions carefully, you do not need to manually adjust the 360 knob to control the pressure release level, the knob is set accurately at the factory. When you receive your goods, you can install and use them directly. Inlet and Outlet Size: The water inlet and outlet have a 2inch outer spiral and a 1-1/2inch inner spiral for applications with a flow rate of 50 gallons to 90 gallons. 2inch outlet and inlet can pass 50-90 gallons of water per minute, which can greatly reduce the water purification time of the pool, convenient and practical. Its design serves as a simple replacement or addition to your existing pool or spa equipment.No need to use expensive or complicated tools to implement-works automatically with your pool filter and pump,allow you and your family and friends to enjoy an clean pool party during the summer. Colour:As Shown Material:PP type:CL200 Package Contents: 1 x automatic chlorinator for inground pool Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.