3M Versaflo BT-953 Cleaning and Storage kit is designed to assist with cleaning and storage for the BT-63/64 breathing tubes. Two caps and one plug are provided for the openings of the BT-63/64 where they would connect to a facepiece and respirator.3M Versaflo BT 953 Cleaning and Storage kit is designed to assist with cleaning and storage for the BT 63/64 breathing tubes. Two caps and one plug are provided for the openings of the BT 63/64 where they would connect to a facepiece and respirator. Helps protect the breathing tube from internal contamination during storage and cleaning.