Material Quality: The shell of the shower restrictor is made of high quality copper, and the flow insert is made of plastic, which has a good anti-rust effect. 3 Different Flow Inserts: The kit contains 3 flow inserts. different flow rates to suit your needs. 1. The green plug-in reduces the water flow to 7 l / min; 2. The blue plug-in reduces the water flow to 4L/min; 3. The yellow plug-in reduces water flow to 9 l/min. Super Water Saving Function: Just like a faucet insert in a basin mixer will cause a reduction in liquid flow , while allowing users to enjoy a constant and effective water diffusion effect. The high performance of the restrictor can reduce water consumption. Easy to Install & Remove: Easily install and remove this water saver tip in seconds. No tools required, just screw it on for easy installation. Wide Range of Uses: A set of water flow restrictor for the shower hose can be installed in the bathtub faucet or the bathroom faucet. shower, the bathroom water saver is suitable for shower, toilet, kitchen, hotel.