Replacement shower cartridge. Suitable for the following showers: Classic Aquavalve 200 Thermostatic 1978 - 1990; Aquamixa Thermostatic 1988 - Current; Aquavalve 600 Thermostatic 1990 - 1996; Aquavalve 700 1992 - Current; Aquavalve 605 Thermostatic 1996 - 1999; Aquavalve 609 Thermosta.
The coil resists the build-up of limescale maintaining an optimum flow rate
The coil reacts almost immediately to changes in water temperature. So, as hot water flows into the Thermo shower, the bi-metallic coil is constantly adjusting and re-adjusting its length to maintain a perfect temperature