ASSE 1020装置安装在供水管线中，以防止非饮用材料通过反虹吸（仅限）进入饮用水供应系统，并用于高风险和低风险应用。本标准于1974年首次发布，以扩展ASSE针对管道应用真空断路器的背压和反虹吸防回流装置的标准组合。

ASSE 1020 devices are installed in water supply lines to prevent the entrance of non-potable material into the potable water supply by backsiphonage (only) and are intended for use in both high and low hazard applications. This standard was first published in 1974 to extend ASSE's portfolio of standards for backpressure and backsiphonage backflow prevention devices for pipe applied vacuum breakers.