The MetroFlush® manual flush valve from Zurn Industries' Commercial Brass Operation is a piston-operated brass flush valve with a polished chrome exterior. The MetroFlush is ADA compliant and features a non-hold-open and no leak handle. The MetroFlush is complete with siphon-gard backcheck protection, vacuum breaker, flush tube wall escutcheon, and fixture spud securing nut for back spud connection. Zurn Industries, Inc. Commercial Brass Operation.