Brass ON / OFF Valve for shower valve replacement. This part is designed for replacement in suitable 3 dial thermostatic shower valves. This part is from the middle of the three dials (water on / off).
The main barrel is 18mm in diameter and overall length 77mm.
Some manufacturers such as Aqulusso list this item as a 17mm valve. This item is compatible.
The most common reason you will need to replace this part is when your shower is not isolating (shutting water off) to which ever feature is selected on the divertor, instead you will get anything from a slight drip up to running water, even when in the off position.
Product design/Colour may vary from the image shown