Accumulators are a product that have been around for years, with new applications and added features it has however been renewed. They can be used to seal flowing material between two connecting parts. Also designed to allow moving components to recoil and not touch other surfaces. Used in slow moving and rapid moving parts. Adding beads at the ends allow for a snap in place feature and for the part to hold in a chamber. Keeping a critical fluid sealed can be only one part of the use when the part has to also compensate for fluid expansion in the application.