Part Number: 43853. Item model number: 43853. Master your jobs with ease and accuracy with the RIDGID Close Quarters ASTM F 1807 PEX Crimp Tool (catalog number 43853). Designed for plumbing experts, this 1/2″ crimp tool is ideal for making PEX tubing connections in potable water and radiant heating applications with ASTM F1807 copper crimp rings.