A Reducing Slip-On Flange (RSO Flange) is a type of flange designed for use in piping systems where a connection is required between two pipes of different sizes. Unlike standard slip-on flanges, the reducing slip-on flange features a bore that tapers from a larger to a smaller diameter, making it ideal for reducing pipe sizes within a piping system. This type of flange allows for easy installation without the need for welding around the entire circumference of the pipe, making it a cost-effective option for many systems.

Reducing slip-on flanges are commonly used in situations where space and cost savings are crucial, offering flexibility for connecting pipes of varying sizes with ease and minimal complexity. Reducing slip-on flanges are adaptable to a variety of materials and pipe sizes, allowing for flexibility in design and applications across many industries.