1/2 to 3/4-in PEX crimp tool The SharkBite PEX crimp dual tool allows you to make a secure connection to 1/2 In. and 3/4 In. PEX with copper crimp rings. 1/2-IN X 3/4-IN PEX CRIMP TOOL. Works with 1/2-in and 3/4-in PEX copper crimp rings.