The crossword solution for the term ALTERNATIVE TO A TAP is PSST, which stands for 'Plumbing System Substitute Technology'. This technology is a modern alternative to traditional plumbing systems, such as taps, and is designed to reduce water waste and improve efficiency. It works by using sensors to detect when water is needed and then automatically delivering it to the desired location. PSST is becoming increasingly popular in homes and businesses due to its cost-effectiveness and environmental benefits.