This vacuum hose assembly is listed at size 12.50 and is a Clarke-numbered replacement part (56265625) for commercial floor cleaning machines. It carries recovered debris and water from the machine's pickup path to the recovery tank. The source data does not specify whether 12.50 refers to feet or another unit, and the specific machine model this hose fits is not documented, so confirm length, unit, and fitting style against your existing hose before ordering.