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material: abs size: standard 15mm connector conversion: 1 inch = 2.54 cm or 1 cm = 0.393 inches function: it is used to connect the wall surface to pre-embed the hot and cold water outlet and the connecting part of the faucet hot and cold water inlet.  reason for use: a. the interface of the general faucet inlet pipe is the inner wire nut, and the wall outlet is the inner wire joint, which needs to be connected by an angle valve. b. the angle valve is a component that can withstand water pressure. it can be closed in time if necessary. it is conducive to the installation and commissioning of the faucet and the maintenance of the faucet. it is not necessary to turn off the total water valve, and other water use areas are not affected. c. the angle valve is the insurance of the faucet. when there is a problem with the faucet, the angle valve can be closed in time to prevent more serious losses. installation precautions: 1) before the installation, the faucet should be cleaned of dirty water, residue, sand and impurities remaining in the water pipe before installing the faucet to prevent foaming blockage or damage to the valve plug. 2), the surface should be cleaned regularly with detergent. after scrubbing, rinse the surface of the faucet with water and wipe it with a soft cotton cloth. then gently wipe it with a neutral detergent to keep the surface clean. do not use any abrasive effect. wipe the surface of the faucet with a cleanser, hard cloth, paper towel or steel ball, and any acid, rough detergent or soap. 3) remove the bubble head, take out the filter, and brush the filter with a toothbrush or a small brush under the faucet. package includes: 1 * faucet note: allow 2-3cm error due to manual measurement the color of the items in the photos displayed on the computer monitor may be slightly different because the display is not calibrated the same if you want buy more than we listed, please contact us. There are so many useful and cheap item in our store. You can contact with us to get more detail of the goods . We are professional Shopee seller.