Replacement screw thermostatic cartridge for shower mixer valve.This cartridge is used in both concealed and exposed temperature controlled shower mixers. Spare Parts Buying Guide: Thermostatic Cartridge for Shower Mixers A shower mixer valve is equipped with a thermostatic cartridge responsible for adjusting water temperature. This specific thermostatic cartridge replacement is suitable with many existing shower mixers (exposed or concealed) in use all over the UK. This short guide will touch upon two questions: – Is the replacement screw thermostatic cartridge the right part for the shower you have to fix?– What are the signs that the shower thermostatic cartridge requires replacement? Thermostatic cartridges are sometimes called temperature cartridges or shower cartridges. With a turn of a shower control knob, these gizmos have the capability to regulate the temperature of water according to a shower user’s preference. Thermostatic cartridges make showering convenient and safe. Thermostatic cartridges can have a brass or a polymer plastic barrel. Generally, limescale is said to adhere less to polymer than brass. The barrel of this screw thermostatic cartridge for exposed and concealed shower mixer valves is made from plastic. Determining if the Screw Thermostatic Cartridge is the Part You Need Measurements are an important factor in determining if the screw thermostatic cartridge for exposed and concealed shower mixer valves is what you need to accomplish a successful shower repair. Note: this replacement thermostatic cartridge is a threaded, screw-in cartridge. To do this, take a simple ruler and measure the length and width of the cartridge and compare it with the measurements of this replacement screw thermostatic cartridge used in exposed and concealed shower valves. Replacement Screw Thermostatic Cartridge Measurements: Total Length (excluding wax thermostat): 96mm Diameter at Thread: 41.7mm Top Spline Diameter: 7.6mm Top Spline Teeth / Notches: 20 Stop Ring Spline Diameter: 20mm Diameter at Top O'ring: 40.5mm Diameter at Middle O'ring: 40mm Diameter at Bottom O'ring: 39.6mm Please pop us a message if you need assistance in ID’ing shower spares. Di Vapor has super friendly and helpful spares experts who are ready to help you. Signs the Thermostatic Cartridge Requires Replacement Concealed or exposed shower mixer valves give telltale signs that the screw thermostatic cartridge is in its last legs. Here are a few: Sign 1: Water temperature becomes erratic (and other temperature issues) while using the shower. This could mean the wax thermostat element at the centre of the screw thermostatic cartridge is not retracting as it used to. This can be the reason behind the water temperature fluctuation. If the shower is stuck on one temperature, it may signify that the wax thermostat element has completely stopped working. Replacing the screw thermostatic cartridge for exposed and concealed shower mixer valves is needed. Sign 2: A sluggish rate of water flow. A mixer shower, whether exposed or concealed, gives a greater amount of water flow compared to electric showers. A good flow rate is considered to be around 15 liters per minute while 10 liters per minute is deemed poor. Scale and dirt can lodge in the filters of the cartridge. And since water passes through the screw thermostatic cartridge, it can hinder the free flow of water and negatively affect the flow rate. It is best – and more cost-efficient – to replace the screw thermostatic cartridge for exposed and concealed shower mixer valves. The basis for this: using descalants can have an adverse effect on the seals of the thermostatic cartridge. Not only will the limescale continue to accrue but the acid can eat away the cartridge’s O-rings which can add leaks to the list of problems. Sign 3: Leaks. As stated above, a dripping shower can be the result of limescale or a damaged cartridge or O-rings. The screw thermostatic cartridge for exposed and concealed shower mixer valves is a sealed cartridge which means there are no replacement seals available. Getting a replacement thermostatic cartridge is a must What else do you need for shower repair? Silicone grease. Silicone grease helps the replacement screw thermostatic cartridge squeeze and seal in the valve properly. It also serves as an O-ring protectant which can help against premature deterioration. However, only heat