Series LFNLF-9 lead-free Dual Check Vacuum Breakers for Laboratory Faucets prevent the reverse flow of polluted water from entering into the potable water supply. It consists of a brass body construction with chrome plating, dual check valves, stainless steel working parts and durable rubber diaphragm and discs. Series LFNLF-9 is designed for health hazard, non-continuous pressure applications. It is specifically designed for laboratory faucets where portable hoses can be attached.