CL1C up to CL17H are a range 3/4 inch, quarter turn ceramic cartridges sold in hot or cold and are a range of cartridges sold to replace leaky taps. 3/4 inch cartridges are generally used for bath taps or taps where water pressure is low and therefore the larger diameter barrel gives more water flow. These are some of the many cartridges we sell for the 3/4 replacement market. It is important to note that there are many different splines which is why we have a large and ever expanding range available. To find out the compatibility with the old cartridge being replaced it is essential that the height and diameter of the cartridge and spline are the same. See our Spline Finder which has been designed to establish the spline size and therefore the ceramic cartridge required. PLEASE NOTE The CL number denoted and stamped onto each cartridge can be measured on our Spline finder using the CC codes on the Spline finder.eg. The CL1 has the same spline diameter as the CC1.