Slip-on flanges are one of the most popular types of flanges used in industrial piping applications. They are easy to install and provide a tight seal, making them ideal for use in high-pressure applications. Slip-on flanges are also less expensive than other types of flanges, making them a cost-effective option for your industrial piping needs. What is a Slip-on Flange and What Types of Systems Can It Be Used On? A slip-on flange is a type of flange that can be installed without the use of tools. Slip-on flanges are designed to be used on systems that have straight pipe connections