PEX A Pipe Fitting

PEX A uses an expansion-style fitting. These fittings are much larger in diameter the PEX B fittings, and require an expansion tool. Using the expansion tool, you enlarge the pipe and sleeve in order slide in the fitting. Because PEX A is expandable, the material’s memory will ensure that it will shrink back to its normal size, tightening snugly around the fitting.