About the collection

The Kay collection is an exploration of presence. Striking a balance between strength and precision, it redefines the squarish faucet with clarity. Designed to be both sculptural and functional, Kay embodies a reduced yet confident aesthetic, seamlessly integrating into contemporary spaces.

Kay’s flat front surface and semi-circular body create a distinct geometric contrast, bringing sharpness and softness into balance. The straight, carefully measured spout ensures an evenly, controlled water flow, while the sculpted body creates fluid transitions that feel natural to the touch. Crafted from cast brass, it achieves both durability and a sculptural presence, reinforcing its refined yet robust character. Available in six curated finishes and cold-water start, Kay adapts effortlessly to any contemporary architectural context.

Casting Form & Materiality

Kay’s form is made possible by cast brass, a process that allows for sharp edges, smooth transitions and uncompromising precision, giving the faucet a sculptural presence that goes beyond mere functionality. Casting gives Kay a tactile quality, where the surfaces feel as though they have been sculpted rather than simply engineered.

Kay is available in six curated finishes — chrome, matt black, matt white, brushed brass, brushed graphite and stainless steel finish — ensuring versatility in a range of architectural spaces. Whether placed in a minimalist setting or a bold interior, Kay maintains a strong yet understated presence.

The brushed brass and stainless steel finishes are enhanced with the exclusive Everlux — a high performance PVD coating applied through a purely physical process. This additional layer, derived from ultra-durable metals, significantly improves scratch resistance and durability.

The collection is defined by its flat front surface and semi-circular body, a contrast that gives the faucet its distinct identity. The floating handle, which appears almost weightless above the body, is the result of extensive engineering refinement that reduces traditional bulk while maintaining seamless function.

Rethinking Interaction

But beyond form, Kay introduces a fundamental shift in the way we interact with water. It is not about what has been added, but what has been decided for you, removing the need to think about sustainability, because the design has already done so.

This principle is embedded in Kay’s approach to water use, eliminating outdated habits and replacing them with intuitive design choices. The traditional blue indicator for cold water has been removed entirely. Cold is the default, so there is no need to mark it; instead, a small, embedded red inlay subtly indicates hot water. This considered detail replaces traditional hot water markings, ensuring durability and seamless functionality over time.

By removing unnecessary visual clutter and making interaction more intuitive, Kay refines not only form, but also function, ensuring a more conscious use of resources without compromising usability. This is sustainability not as an external feature, but as an inherent logic; one that shapes user behaviour without constraints while setting the tone within the industry.

Enhancing Adaptability

The Kay collection extends across a comprehensive range, offering solutions for various architectural contexts. Basin mixers are available in standard and XL sizes, while the elegant three-hole configuration introduces a refined level of sophistication. Built-in two- and threehole options allow for seamless integration into both contemporary and traditional settings. Wall-mounted bath and shower mixers, including RocaBox-compatible models, provide greater design flexibility.

With water-saving aerators that limit flow to five liters per minute, Kay balances performance with sustainability while maintaining a precise, controlled water flow. Every faucet undergoes testing for over one million opening and closing cycles, ensuring long-term durability and flawless function.

The Designer

Stefan Diez is a German industrial designer known for his innovative approach to materials, circularity and production methods. Trained as a cabinetmaker before studying under Richard Sapper, he founded Diez Office in 2003. His Munich-based studio collaborates with brands such as Rosenthal, Thonet, HAY, Magis and Vibia, shaping products that merge industrial precision with a human-centered design philosophy. Since 2018, Diez has led Industrial Design at the University of Applied Arts Vienna, mentoring the next generation of designers.

At the core of his work are his Circular Design Guidelines, which promote durability, repairability and adaptability — minimizing environmental impact while ensuring long-term relevance. In the development of Kay, designer Madeleine Wieser played a key role, ensuring that its design reflects Diez Office’s commitment to precision, material intelligence and essential form.