# 820C OMT o-ring specs

**URL:** https://community.cambiumnetworks.com/t/820c-omt-o-ring-specs/62955
**Category:** PTP
**Created:** [August 8, 2019, 8:44pm UTC](https://community.cambiumnetworks.com/t/820c-omt-o-ring-specs/62955 "2019-08-08T20:44:26Z")
**Posts on this page:** 4
**Page:** 1

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### Author: ![calebknauer1](https://d10gw3vjmzyp8.cloudfront.net/letter_avatar_proxy/v4/letter/c/91b2a8/32.png) [@calebknauer1](https://community.cambiumnetworks.com/u/calebknauer1)
#### Post date: [August 8, 2019, 8:44pm UTC](https://community.cambiumnetworks.com/t/820c-omt-o-ring-specs/62955/1 "2019-08-08T20:44:26Z")

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Anyone know the o-ring specs for 820C with OMT?&nbsp; In need of a couple and don't want to just try to match diameter.&nbsp;

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### Author: ![calebknauer1](https://d10gw3vjmzyp8.cloudfront.net/letter_avatar_proxy/v4/letter/c/91b2a8/32.png) [@calebknauer1](https://community.cambiumnetworks.com/u/calebknauer1)
#### Post date: [August 9, 2019, 9:33pm UTC](https://community.cambiumnetworks.com/t/820c-omt-o-ring-specs/62955/2 "2019-08-09T21:33:55Z")

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Support doesn't know because it's part of a kit :(

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### Author: ![carver](https://d10gw3vjmzyp8.cloudfront.net/user_avatar/community.cambiumnetworks.com/carver/32/21830_2.png) [@carver](https://community.cambiumnetworks.com/u/carver)
#### Post date: [March 19, 2026, 10:32pm UTC](https://community.cambiumnetworks.com/t/820c-omt-o-ring-specs/62955/3 "2026-03-19T22:32:08Z")

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Hi, did you find anything o-ring/xxx-ring for ptp820 ?

for my 11G

I thought the caps or gland needed an OD30xCS2.5 O-ring. I bought several different ones, and the OD30 seems to be the best.

But do find the rings for the OMT? It’s not O-ring in my OMT. There’s also a ring for the antenna; it looks very similar to the OMT ring.

Thanks.

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### Author: ![carver](https://d10gw3vjmzyp8.cloudfront.net/user_avatar/community.cambiumnetworks.com/carver/32/21830_2.png) [@carver](https://community.cambiumnetworks.com/u/carver)
#### Post date: [March 20, 2026, 10:50pm UTC](https://community.cambiumnetworks.com/t/820c-omt-o-ring-specs/62955/4 "2026-03-20T22:50:00Z")

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> [@calebknauer1](#):
>
> Support doesn’t know because it’s part of a kit ☹

Perhaps you also encountered rowers from India.

I wouldn’t be surprised if they offered to sell you new OMTs instead of replacing the rubber bands.

I took a photo of my OMT rubber bands, but I can’t figure out what they’re named.

i can buy the Q-ring or D-ring for $2-3, a pack of 50 rubber bands.

but it’s a triangle and I don’t know yet what they could be named.

> **Click to see a photo of my OMT rings**
>
> ![photo_2026-03-21_00-52-42](https://d1okf4ta8xniw3.cloudfront.net/original/3X/4/7/47bb27daba8e47e2eb8e62d9d6b9211e751fbcb2.jpeg)