5/8 in. Rapid Seal ProPEX Expansion Tool HeadThe Milwaukee 5 8 in. 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 users 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