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A steel lined PTFE cross is a specialty piece of plumbing that combines the superior chemical resistance and non-stick qualities of PTFE with the strength of steel. It is made for tough industrial applications where smooth flow transitions, high temperatures, and resistance to corrosive chemicals are crucial...
link:https://www.ttptfe.com/steel-lining-ptfe-pipes-and-fittings/steel-lined-ptfe-cross.html
Steel lined PTFE Cross