- After each dive, rinse the transmitter with fresh water to remove salt and debris.
- If necessary, clean the transmitter with a soft cloth.
Select your product to confirm this information applies to you
How to Service a Descent Transmitter
Garmin offers replacement parts for the Descent™ T1 Transmitter and the Descent™ T2 Transmitter. With replacement parts, you can service your Descent transmitters as needed. Below you will find links to replacement parts Garmin offers, steps for keeping the transmitter clean, and for servicing the transmitter. To prevent damage to the transceiver and possible loss of function, do not overtighten. Do not grip the regulator or the transceiver to move, carry, or adjust the tank.
Replacement Parts
IMPORTANT: Garmin does not recommend use of third-party Air Spools, Flow Restrictors, or other accessories with the Descent transmitters.
Air Spool and Flow Restrictor Kit
Servicing the Transmitter
See our video below for steps on servicing your Descent transmitters. When replacing the battery make certain to use a new 3V CR123A lithium battery. Do not use a rechargeable battery, or any battery with voltage other than 3 volts. The video demonstrates the process on a Descent T1 transmitter, but you can use the same steps to service your Descent T2 transmitter.
Several o-rings are used to seal the Descent transmitters. If you are replacing an o-ring, it is recommended to apply silicone grease to keep the rings from breaking down over time.
Below are the sizes and materials for the o-rings found on the Descent transmitters and the accessory parts. The sizes for all o-rings and fittings are the same on the Descent T2 transmitter and the Descent T1 transmitter.
IMPORTANT: We recommend using the o-rings from the above kits or with dive approved parts that can be purchased at a dive shop.
High-Pressure Fitting (Descent Transmitter) O-Ring
- Size: Internal Diameter 9.25 mm x 1.78 mm
- Material: 90A Durometer FKM
Battery Cap (Descent Transmitter) O-Rings
Inner (Red) O-Ring:
- Size: Internal Diameter 19 mm x 1.40 mm
- Material: 70 Durometer Silicone (Red)
Outer (Black) O-Ring:
- Size: Internal Diameter 19 mm x 1.60 mm
- Material: 70 Durometer Silicone (Black)
Flow Restrictor (Accessory) O-Rings
Two o-rings are needed. Both are the same material and dimensions.
- Size: Internal Diameter 3.30 mm x 1.00 mm
- Material: 70 Durometer Neoprene
Air Spool (Accessory) O-Rings
Large Side
- Size: Internal Diameter 3.30 mm x 1.00 mm
- Material: 70 Durometer Neoprene
Small Side
- Size: Internal Diameter 1.50 mm x 1.50 mm
- Material: 70 Durometer Viton
To replace the battery, you need a coin or flat screwdriver, a new 3V CR123A lithium battery, and waterproof silicone grease. You may also need a replacement battery cap accessory. When replacing the battery, do not use a rechargeable battery and only use 3 volt replacement batteries. Do not use a 3.7 volt or any other voltage battery.
See your transmitters owner's manual and the video above for steps on replacing the battery.