Use this kit to replace the o-rings on your compatible Descent^™ T1 or T2 during routine service. You can also keep this kit as a backup in your dive gear in case an o-ring is damaged on your next dive trip. Includes 2 complete sets of o-rings for the battery cap (inner and outer), high-pressure fitting, flow restrictor and air spool, as well as silicone grease to keep the rings from breaking down over time.