Description: 【Adjustable Design】This product can be used without a pump, but the water spray height will be low If you hope you can get a better fountain effect as on the product picture, please use a high power pump. 【For 1.5in 】Our pool fountain spray water fits for 1-1/2'' threaded return fittings. Please remove the threaded joint on the in the swimming pool during installation. If only the jet nozzle is removed, the thread may be greater than 1.5 ". 【Multiple Occasions】Our pool fountain spray sprinkler can be used both above and in ground, applicable for most of pools,hot springs,ponds and spas. Besides, when not in use, it can be hidden under the water. Tips: Please measure your swimming pool size before buying. This product is not fit for swimming pools that do not 1-1/2" return jets. 【Adjustable Flow】There is an adjustable water on the product that increases the water pressure when the water is fully closed, allowing the water to be sprayed higher As easy as replacing a directional flow inlet fitting, you can rotate the switch for controling the water output to get a great waterflow for you and your families to enjoy and the soothing sound of water. 【Cool Feelings】Our product can reduce the temperature of the water in your pool by 4 or 5 degrees if you run it during the night. It also when you are just floating around on a . Specification: Material: PVC Size Chart: 26cmx36cmx19cm/10.24inchx14.17inchx7.48inch Package Includes: 1 Fountain Fun Sprinkler  Note: Please allow slightly errors due to manual measurement and different monitors.