T2 transmitter orings

Hi there.

Did anyone have the same issue and/or do you have access to those specific orings anywhere on the market?

I have a local shop specialising in orings in general and their opinion is that '70 durometer neoprene' that has been specified in Garmin documentation is durable till 160 BAR. This is interesting, as these orings are in HP port of the regulator and the working pressure there is much higher.

What are your thoughts?

Regards,

Adam

P.S.

Despite having dozen of emails with Garmin support and a promise of "some solution' and spare parts sent to me I am still waiting ;-/

Hi Adam,

I have had one leaking o-ring on my T2 connected to a short HP hose, but fortunatly it happend on land right after opening the tank. I was at my dive shop, they replaced the o-ring and it held for my next 14 dives of the trip. My next dive trip is in two months, am looking to get some spare o-rings now just in case.

Do you have any more info? Did you get any spares? Did you get sturdier ones than the specified 70 durometer neoprene?

Hi.

Well… the orings Garmin provides are braking every ~dozen dives for me. Unfortunately, I did not find exact after market purchaseable ones yet that match the specifications from the documentation.

I am now on the last spare I got from Garmin support. It was the worst customer experience of going back and forth with their representatives explaining the issue again and again. Finally they promised to send the spares and they did, but it took another few weeks. So ultimately- I got a spare kit of few pieces (3-4). If someone contacts me to hear the voice of customer I would be happy to complain :-) I was a huge Garmin advocate but this issue is Monty Python one.

I consider it a huge design flaw to use non-standard size and the fact that you cannot purchase them. They’re only available in the flow restrictor kit, which is priced ridiculously.

I would you suggest you to take a shot and try with Garmin support. Perhaps they will be more effective than in my case.

Regards

 Adam

Hi Adam,

Thanks for you reply :)

Just to confirm, looking at the Garmin support link in your original post, are you having issues with the "High-Pressure Fitting (Descent Transmitter) O-Ring" or with one of the "Air Spool (Accessory) O-Rings"? For me it was the High-Pressure fitting o-ring.

My issue is with the one in flow restrictors: 3.30 mm x 1.00 mm

Oh I thought u used it on a hose as well? The flow restrictor is for use directly in the 1st stage.

There are two. One for using directly in the 1st stage, second for using with HP hose. All other transmitters on the market use standard spool for that, but Garmin decided on non-symmetric one with thicker end that goes into the transmitter. This one has the non-standard oring. The same as for the restrictor that is used while attaching directly, without a hose.

I'm curious to know if others are facing similar issues too, or even if some are facing no issues. I was planning on buying the transmitter and using it on a short HP hose. Finding out about the non-standard parts and o-ring definitely made me reconsider. I wonder if Garmin can develop a new spool/restrictor with more standard dimensions and parts?

Update September 4, 2025:

Garmin has been investigating this report and have discovered what is a contributing factor to the O-rings breaking and have the below recommendation to help mitigate this issue.

If the Air spool or O-ring is installed off-axis, then the O-ring can catch on the side of the pressure fitting and get torn during installation. Even if the O-ring doesn't tear immediately, it will cause permanent damage to the O-ring and increase the chance of failure on another installation. 

Correct Install: 

Incorrect Install: 

We recommend that installing the snubber/air spool slowly and with little pressure. If the snubber/air spool is aligned, it should smoothly enter the pressure fitting. If you notices that the part stops and won't move, the O-ring has caught and any additional pressure may damage the O-ring.