All of our simplex and duplex strainers/filters utilize true union connections to significantly simplify installation and maintenance procedures. Essentially, true union connections enable the user to remove the strainer body from the pipeline, or perhaps more commonly, replace a connecting nut without needing to cut the pipeline.
During the initial installation, the strainer body can be removed after the piping measurements are made which makes it easier to attach the connectors to the pipe. Once the connectors are attached, the strainer is slid in-place and the nuts create the liquid-tight connection.
The strainers are designed to "fail" at the connection nut and/or chamber cover in the event they experience over-pressurization; this sometimes occurs if water hammer is not considered. Failing at these locations provide a "controlled leakage event" rather than a true "explosion" of the strainer body. Although it would be tempting to salvage the strainer body in such a situation, it would be prudent in such a case to replace the entire strainer because it cannot be known if other components were weakened. Thus the main advantage of true-union connections is its ease of installation and replacement.