The NS Series floating ball valves and NS Series butterfly valves from A-T Controls are NSF 61 (Drinking Water System Components- Health Effects) and NSF 372 certified (Drinking Water System Components- Lead Content). NSF 61 means that NS Series valves are certified in water treatment, water purification, potable water, and water distribution systems (Underwriters Laboratories) and meet North American lead content criteria for “lead-free” plumbing.
