The MILWAUKEE® 1" 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.