Mechanical seals and bearings often suffer from inadequate lubrication, third-body wear and temporary dry running. This can lead to rapid failure of the components. As a new generation of sliding couplings, the ultra-hard and low-friction finish of diamond-coated SiC surfaces (not to be confused with DLC!) offers a solution. No changes need to be made to the design! Just the replacement of the seal faces by diamond coated ones is required.