The 3M™ Versaflo™ Easy Clean Holster TR 657 is designed for use with the 3M™ Versaflo™ Battery Adapter TR 659 Adapter and 3M™ Versaflo™ Standard Battery TR 630. The holster is used to keep the battery and adapter combo protected and secure during use. This product is meant for use with 3M™ Belt Mounted Powered Air Purifying Respirator GVP by users that need a new power source to work with their existing systems.