Series 909S-AUS prevents the reverse flow of polluted water from entering into the potable water supply due to backsiphonage or backpressure where there is a potential health hazard. An exclusive relief valve design provides substantially improved relief valve discharge performance during emergency conditions of combined backsiphonage and backpressure. These small diameter backflow preventers are available in DN15 to DN50 sizes. Series 909S-AUS for small diameter assemblies has a compact modular design that facilitates easy maintenance for in-line repairs. It can be installed horizontal or vertical without the need of any special tools.

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Series 909S-AUS prevents the reverse flow of polluted water from entering into the potable water supply due to backsiphonage or backpressure where there is a potential health hazard. An exclusive relief valve design provides substantially improved relief valve discharge performance during emergency conditions of combined backsiphonage and backpressure. These small diameter backflow preventers are available in DN15 to DN50 sizes. Series 909S-AUS for small diameter assemblies has a compact modular design that facilitates easy maintenance for in-line repairs. It can be installed horizontal or vertical without the need of any special tools.