1 Expansion Pex A Head for use with the hand operated PEX A tool. For use with cold expansion pex A pipe and sleeve system. •Requires Apollo Expansion PEX tool for use sold separatelyDesigned exclusively for use within 1 inch Type A PEX piping systemsEasy screw on threads to seat onto toolChrome plated steel construction for superior reliability, strength and weather resistanceProvides a more consistent and even expansion of the tubingLaser etched size indicator makes identification simple