What is a key characteristic of a duplex strainer?

A key characteristic of a duplex strainer is that it is equipped with two filter elements. This design allows for one filter element to be in use while the other is either cleaned or replaced, providing continuous operation without interruption. The dual filtration capability is particularly beneficial in applications where maintaining liquid flow is crucial, as it prevents downtime for maintenance or cleaning of the strainer.

In contrast, options suggesting that a duplex strainer is limited to a single use or has only one filter element do not apply, since the primary function of a duplex strainer is to offer redundancy through its two filter elements. The option that indicates no maintenance is required also does not accurately describe duplex strainers, as regular maintenance is necessary to ensure optimal performance and prevent clogging of the filters.