Dynamically design tubes by adding bends and changing dimensions to create exactly what you need. Then use the apps output along with the Reftekk Digi-Bender to create the tube you designed. This app is designed to be used with the Reftekk Digi-Bender. Do not use it with any other bender.This app is designed to be used with H55 ACR Type-L bendable copper tubing. Do not use any other tubing.