Introduced more than a decade ago, Uponor ProPEX fittings continue to quickly and easily make watertight PEX connections with no callbacks. Capitalizing on the unique thermal shape memory of Uponor’s PEX-a Engel-method tubing, ProPEX connections get stronger over time. ProPEX does not involve making solder joints and does not require any primers or the use of solvent cement. The fittings offer a larger inside diameter so flow restrictions are minimized. Available in both brass and engineered plastic.