This category covers HD & HDS Connectors & Adaptors designed to convert between the various connection standards used across professional pressure washer machines, hoses, lances, and accessories, allowing operators to safely and correctly connect components in mixed or evolving equipment setups. These connectors and adaptors play a critical role in maintaining compatibility between modern professional systems and older or Classic equipment, supporting flexibility when upgrading machines, replacing worn components, or integrating existing accessories into current professional pressure washer configurations. Suitable for use with cold and hot water pressure washers, this range helps ensure correct fitment, secure connections, and reliable water flow across demanding commercial and industrial cleaning environments. By converting between EASY!Lock trapezoidal connections, legacy metric connections, and other professional standards, HD & HDS connectors and adaptors help prevent leaks, pressure loss, and component damage that can occur when incompatible fittings are used. Their use supports safe operation, consistent performance, and efficient working practices when multiple Kärcher standards are in use, protecting equipment investment and supporting long-term reliability in professional cleaning operations.