Valsir VS0846101 product code refers to a Valsir Perk Single Flush External WC Cistern (sometimes referred to as low-position or exposed). It is a durable plastic cistern designed for wall mounting in a traditional "backpack" or low-level installation, where the cistern is visible above the toilet pan. 
Key Features
Installation Type: Exposed / Low-position wall mounting (not a concealed/in-wall frame).
Flush Type: Single flush with a mechanical operation and a "stop" function, allowing the user to control the flush duration and save water.
Flush Volume: Configured for a 6-liter capacity flush volume, which can be adjusted.
Design: Features an elegant, modern design with rounded lines, intended to blend seamlessly with contemporary bathroom ceramics and decor.
Material: Made from high-quality, durable, and long-lasting plastic materials designed for reliability and sound insulation.
Ease of Use & Maintenance: Engineered for simple installation and easy access to internal components for maintenance without specialized tools.
Compatibility: Suitable for use with standard back-to-wall WC pans.