Pipe crosses, also known as four-way fittings, have one inlet and three outlets and often feature solvent-welded socket, or female-threaded ends. Cross pneumatic fittings may stress pipes as temperatures change due to their four-way nature. Because of this, pipe crosses are generally not used as plumbing hydraulic components. Instead pipe crosses are more beneficial in situations where thermal expansion is not an issue, such as fire sprinkler system applications.
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