Premium Quality: Our quarter turn tap cartridge is made of high-quality brass and ceramic, which is sturdy and durable enough to resist high temperatures, serving you for a long period. Universal Valve Insert:There are 20 gears on top of the valve core, the outside diameter is 7.5mm, the inside diameter is 4mm, the total length is 50mm. It is the most commonly used size of the tap cartridge valve. Good Sealing:This faucet valve has an easy-to-use black rubber lock washer to seal the faucet, prevent the faucet from running out, and save the trouble of replacing the faucet again, making your life easier. Easy to Install:This kit contains two ceramic faucet valves (1 x blue and 1 x red) with 2 4 mm screws. The red and blue O-rings on the bottom of the spool make it easier to distinguish and install, cold water with blue bottom, hot water with red bottom. Widely Used:Two ceramic faucet valves for taps in bathrooms, kitchens etc. Can be used for single or double hot and cold water taps. Please check the dimensions carefully in the photo before purchasing to ensure it will be compatible with your tap.