This is a genuine Sirrus by Gummers SK1850-2 thermostatic cartridge which includes the wax thermostat element.Most other retailers don't include the wax element with the SK1850-2, however the wax element is the heart of the cartridge and is the part which adjusts the temperature of the water. This SK1850-2 is used in a number of valve including Bristan 1901. Two thermostatic cartridges have been used in the 1901 range. If the flow handle turns a maximum of ¼ turn for the shower to be fully on then the replacement cartridge has a code of:- CART 06732COMPL.If the flow handle turns a maximum of ¾ turn for the shower to be fully on then the replacement cartridge is the SK1850-2 on this page.Frequently Asked Question: Bristan / Sirrus SK1850-2 Thermostatic Shower Cartridge Question: Can you tell me what are the factors that would necessitate me to change my shower’s cartridge?Answer: Showers that go too hot or too cold, temperature that swings hot and cold while using the shower, weak water flow, and a stiff temperature handle are some of the reasons why you need to replace the thermo cartridge.Question: Can you give me a list of shower valves that are compatible with this spare part?Answer: The Bristan / Sirrus SK1850-2 complete shower cartridge is for:– Bristan Damixa Saturn-T– Bristan Tulsa– Bristan 1901 Term– Sirrus Heritage– Sirrus Mayfair Antique and Dual– Sirrus Redring Dual– Sirrus Tre Mercati– Sirrus Ts 1850 Antique– NewTeam Ikon Super– NewTeam Victoriana– NewTeam 968– Showerforce Vienna T– Showerforce 998T– Shires C2000If you have further questions about the compatibility of this Bristan thermostatic cartridge spare part, please do not hesitate to send us a message. We will respond to you as soon as we can.Question: Why is my Bristan shower only running cold water?Answer: Both hot and cold water from the supply lines must flow into the thermostatic cartridge. If both are okay, the thermostatic cartridge might be at fault and the cold temperature it is producing is the temperature point from where the cartridge failed. You have to replace it with a new Bristan thermostatic shower cartridge SK1850-2 to get your shower up and running back to normal.Question: Is it possible to receive this shower cartridge spare part asap?Answer: Yes. This genuine Bristan / Sirrus SK1850-2 shower cartridge spare part can be dispatched on the same day when you order it before 3:00 PM (Mondays to Fridays only).Question: What is the seal kit that goes with this cartridge?Answer: SK1850-1 is the seal kit for this cartridge. Changing the seal kit together with the thermostatic cartridge is one way of ensuring the leak repair will be long-lasting.We carry many other Bristan, Sirrus, and Gummers spare parts. Bristan SK1850-2 Removal and Installation Before starting, please switch off hot and cold water supplies.1. Flick the centre indice out of the temperature control handle. Then, proceed to unscrew the retaining screw you’ll find once the indice is out.2. Remove the handle assembly. (Followed by the circlip and the flow control handle.)3. Pull the sleeve out to access the old thermostatic cartridge.4. Use a 46mm spanner to twist the cartridge anti-clockwise to remove. Also, remove the thermostat and piston assembly and the spring.5. Assemble the new Bristan / Sirrus SK1850-2. Apply a thin layer of silicone grease on all the O-rings of the cartridge. 6. Fit the new shower cartridge in the valve seat. Tighten in place using the 46mm spanner. 7. To restore the handles of the shower unit, please do steps 1 to 3 backward.Note: To calibrate the new Bristan thermostatic shower cartridge, place the temperature handle on top of the splines.– Turn it clockwise to lower the temperature.– Turn it anti-clockwise to increase the temperature.