Thermostatic Cartridges Type 6, 8 & 12

Water running lukewarm, suddenly too hot, or swinging between the two usually means the thermostatic cartridge behind the temperature dial has failed. Cartridges are not universal. For Type 6, 8 and 12, knowing your cabin’s make won’t tell you which one you have, so take yours out and compare before you order. We also stock cartridges made for Insignia, Vidalux, Aqualusso and Eago cabins. Can’t tell yours apart? Send us a photo.

Showing all 11 results

  • Temperature Safety Lock

    Temperature Safety Lock

    £3.99     View Item
  • Type 6 Vernet SchematicType 6 Thermo Cartridge - Push-Fit

    Thermostatic Cartridge Type 6 Vernet Wax Sensor

    £69.99     View Item
  • A high-resolution studio image of an Aqualusso thermostatic cartridge, shown isolated against a white background. The cartridge features a cylindrical metal body with multiple precision-machined sections, including a splined control spindle at the top, threaded collar, integrated O-ring seals, and a finely textured mid-section designed to regulate water temperature accurately. This component is the Vernet wax sensor thermostatic cartridge fitted inside Aqualusso three-dial thermostatic shower mixer valves, where it is responsible for maintaining a consistent and safe water temperature. It is commonly replaced when an Aqualusso steam shower, shower cabin, or steam shower bath begins running lukewarm, excessively hot, or becomes difficult to adjust due to a seized or failing cartridge. The cartridge design incorporates both a grub screw fixing and a threaded fitting, making it compatible with the different valve assemblies used across Aqualusso models since 2007. It is suitable for Aqualusso Alto and Opus shower cabins, including models now sold exclusively through Victorian Plumbing. This replacement cartridge is supplied as Aqualusso part number SP182 and uses a genuine Vernet nylon wax sensor, offering improved reliability and temperature stability compared to standard thermostatic cartridges. Depending on production batch, the cartridge may be supplied in either a brass or chrome-finished steel exterior; both versions use the same high-quality Vernet internal sensor and are fully compatible replacements for the original cartridge fitted to Aqualusso shower systems.

    Aqualusso Thermostatic Cartridge – Opus & Alto Cabins

    £69.99     View Item
  • Insignia Thermostatic Cartridge - Compatible Model

    Insignia Thermostatic Cartridge – Compatible Model

    £69.99     View Item
  • Insignia Thermostatic Cartridge - For Steam and shower cabins

    Thermostatic Cartridge Type 8 Vernet

    £69.99     View Item
  • Vidalux Thermostatic cartridge for steam showers and hydro shower cabins

    Vidalux Thermostatic Cartridge

    £69.99     View Item
  • Colorspa Schematic thermostatic cartridgeColorspa Thermostatic Cartridge

    Thermostatic Cartridge CS1

    £59.99     View Item
  • Type 12 threaded thermostatic cartridge

    Thermostatic Cartridge Type 12 – Replacement for Shower Valve

    £49.99     View Item
  • Type 8 Threaded Thermo Cartridge

    Thermostatic Cartridge Type 8 – Threaded

    £49.99     View Item
  • Eago Ariel Platinum Replacement thermostatic cartridge Vertical ViewEago Ariel Platinum Replacement thermostatic cartridge

    Eago Ariel Platinum Thermostatic Cartridge

    £49.99     View Item
  • Thermostatic Cartridge Type 6Type 6 Thermostatic Cartridge for steam and shower cabin

    Thermostatic Cartridge Type 6 – Push-Fit Style

    £49.99     View Item

How to identify your cartridge

  • Fixing: push-fit cartridges are held by a grub screw (Type 6, CS1 and the push-fit Type 12). Threaded ones screw in (Type 8 and the threaded Type 12).
  • Overall length: Type 6 is 92mm, Type 8 is 82mm and the Eago Ariel Platinum is 90mm. The Type 12 dimensions are on its product drawing.

Symptoms and likely causes

Temperature swinging hot and cold: see why the water temperature fluctuates. A cartridge that keeps failing points to unbalanced hot and cold pressures.

Stuck on hot or cold, or never properly hot: see water stuck on hot or cold.

A stiff temperature dial: see a stiff control knob.

Which parts fit your cabin

BrandModels / rangesOur part
InsigniaInsignia part SP182 (Vernet screw fit): 67 models across the GT (18), INS (18), Platinum (12), Premium (8), Kids (7), Monochrome (2), Noire (1), Sports Fitness (1) rangesInsignia Thermostatic Cartridge – Compatible Model
Thermostatic Cartridge Type 8 Vernet
InsigniaInsignia part SP043 (safety lock ring): 109 models across the INS (28), GT (22), Kids (18), Platinum (13), Premium (12), Monochrome (8), Sports Fitness (8) rangesTemperature Safety Lock
VidaluxSS80, SS90, SS1000, SS1200 Left, Right and Rectangular, Essence 800, 900 and 1000, Essence Classic 800 and 900 (11 models); also Pure and Hydro Plus cabins from 2015Vidalux Thermostatic Cartridge
VidaluxSS80, SS90, SS1000, SS1200 Left, Right and Rectangular, Essence 800, 900 and 1000, Essence Classic 800 and 900 (11 models)Temperature Safety Lock
AqualussoOpus and Alto models from 2007Aqualusso Thermostatic Cartridge – Opus & Alto Cabins
EagoAriel Platinum rangeEago Ariel Platinum Thermostatic Cartridge
ColorspaColorspa cabins, among othersThermostatic Cartridge CS1

These are popular fits, not a full list. If your model isn’t here, a photo will confirm it.

Fitting tip

On Vidalux cabins, look behind the shower before you start. The bottom dial may have a small screw in the valve body holding the cartridge in. Take it out first, and refit it once the new cartridge is in.

When to call a professional

Isolate the water first. The cartridge comes out from inside the cabin (on Vidalux, check behind first), so it’s a straightforward swap. Our cartridge replacement guide walks you through it. If the valve body behind the panel is leaking, or your hot and cold pressures need balancing, call a plumber.

Frequently asked questions

Why has my cartridge failed?

Limescale from hard water is the usual cause. Age and grit from the pipework are the others.

Should I choose a standard or a Vernet cartridge?

Either. The Vernet is a branded wax sensor cartridge, sold as a direct alternative to the standard Type 6 or Type 8, so both fit the same valves.

What does the temperature safety lock do?

It holds the temperature at 38°C unless you press the button on the knob to override it, which helps prevent scalding for children or older people. It fits our Type 6, 8 and 12, Vernet and CS1 cartridges.

Got the old one out? Photograph it end to end against a ruler, showing both ends and how it fixed in, and we’ll match it.