KF flexible bellow is designed to expand, contract, and absorb vibrations in order to compensate for pressure and temperature variations as well as any movement or shifting of pipes. Metal bellows fit between piping or ducting joints and flex and expand as needed to extend the life and performance of a piping system. RubyVac is a leading KF bellow manufatcurer since 2007, there are many different types of flexible vacuum bellows and each type is designed to suit a different purpose and level of performance.