Inventive Creations supply a large range of universal ceramic replacement tap inserts. It can be difficult sometimes to identify which tap insert you need due to the differing types available. This must have tool solves all of this. By simply placing the spline of your existing cartridge into the finder you can establish which one fits. Each hole is clearly marked with the cartridge type so you know which ones to purchase. This tool is designed for use by the trade professional and DIY enthusiast who wishes to keep their existing leaky taps without the cost and time of replacement.