2-IN-1 PEX Crimping Tool: IWS-1234W PEX crimp dual tool allows you to make a secure connection to 1/2 In. and 3/4 In. PEX with copper crimp rings. Compact Design: The angled head allows easier access to connections in tight spaces. There are no loose components, jaws to change, or adjustments to be made to create a connection. Compatibility: Ideal for connecting copper crimp rings made to ASTM F1807 standard (Sioux Chief, Watts, Nibco and other brands) with crimp style brass and poly(PPSU) PEX fittings manufactured to ASTM F1807/F877 or F2159 standards respectively (Everhot, Nibco, Watts, Apollo, etc.). Secure Connection: Connections may be checked for security using the Go/No-Go Gauge (included). Each clamp ring shall be gauged to ensure that it has been crimped properly and for the accuracy of the tool. Applications: Ideal for use in tight spaces such as manifold installations, under closet potable water plumbing.