Apollo ExpansionPEX tool is used in conjunction with 1/2 In, 3/4 In. and 1 In. expander heads to expand PEX-A pipe for potable and hydronic PEX-A system installations. For use with cold expansion PEX-A pipe and sleeve system. Lightweight aluminum alloy construction. Compatible with Uponor (Wirsbo) ProPEX piping systems. ASTM F1960.