Introduced more than a decade ago, Uponor ProPEX fittings remain the surest method for making watertight Uponor PEX-a connections fast and easy. Capitalizing on the unique, thermal shape memory of Uponor’s PEX-a tubing, Quick and Easy fittings actually get stronger over time. No need to worry about behind-the-wall connections: ProPEX joints will last the life of the building.