Rothenberger 12426 Professional Pex Crimper, 3/4-Inch Constructed of hardened steel for durability with an Ultra-Lite fiberglass reinforced composite handle Rothenberger pex crimpers are ideal for making copper crimp ring connections in potable water and radiant heating applications Each tool is supplied with a Go/No Go gauge, and crimps to meet ASTM F1807 specifications. The crimp cavity does not skive the copper ring or cause it to fishtail during the crimping process, while the glass-filled composite handles reduce fatigue; especially when working overhead Properly maintained crimpers are expected to make over 100,000 crimps in their life cycle