The MILWAUKEE 3/4" ProPEX Expander Heads with RAPID SEAL are precision engineered for accurate expansions and auto-rotating compatibility. Milwaukee designed the RAPID SEAL expansion head segments to deliver up to 65% faster sealing of connections as temperatures decrease, ultimately providing the fastest times to begin a pressure test. Made from high strength steel, the chrome-plated segments, and black oxide ring combine durability and weather resistance. Optimized for use with M12 FUEL ProPEX Expander, heads are compatible with Milwaukee M12 and M18 Expanders except for the M18 FORCE LOGIC ProPEX Expansion Tool. Size markings on the ring and collar surface provide easy recognition at any orientation.