# Size of O rings for cable penetrators **URL:** \ **Category:** Blue Robotics Products\ **Created:** [February 19, 2018, 6:20am UTC](https://discuss.bluerobotics.com/t/size-of-o-rings-for-cable-penetrators/2189 "2018-02-19T06:20:48Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![James1](https://avatars.discourse-cdn.com/v4/letter/j/c67d28/32.png) [@James1](https://discuss.bluerobotics.com/u/James1)\ **Post date:** [February 19, 2018, 6:20am UTC](https://discuss.bluerobotics.com/t/size-of-o-rings-for-cable-penetrators/2189/1 "2018-02-19T06:20:48Z")
Can someone tell me the exact size of the O rings for the cable penetrators? I’m based outside of the US but I need some soon so I’m looking to buy them in my home country. However, I don’t know the exact sizes as they are not mentioned here: [https://www.bluerobotics.com/store/connectors/penetrator-o-ring-set-r1/](https://www.bluerobotics.com/store/connectors/penetrator-o-ring-set-r1/) ---
**Author:** ![Jonathan](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.bluerobotics.com/jonathan/32/676_2.png) [@Jonathan](https://discuss.bluerobotics.com/u/Jonathan)\ **Post date:** [February 20, 2018, 6:51pm UTC](https://discuss.bluerobotics.com/t/size-of-o-rings-for-cable-penetrators/2189/2 "2018-02-20T18:51:20Z")
Hi James, The o-rings that we use for cable penetrators are size 013. [Here](https://www.mcmaster.com/mvb/library/20150615/9452k570l.gif)is a link to a drawing with the dimensions of the penetrator o-rings. Best, Jonathan ---
**Author:** ![mmtech](https://avatars.discourse-cdn.com/v4/letter/m/2acd7d/32.png) [@mmtech](https://discuss.bluerobotics.com/u/mmtech)\ **Post date:** [February 3, 2023, 4:57pm UTC](https://discuss.bluerobotics.com/t/size-of-o-rings-for-cable-penetrators/2189/3 "2023-02-03T16:57:55Z")
What durometer? The McMaster link no longer goes to a drawing. Is this the part? [McMaster-Carr](https://www.mcmaster.com/9452K57/) And are these the same for the radial o-rings for the switch and vent plug? Thank you. ---
**Author:** ![EliotBR](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.bluerobotics.com/eliotbr/32/6937_2.png) [@EliotBR](https://discuss.bluerobotics.com/u/EliotBR)\ **Post date:** [February 6, 2023, 12:20pm UTC](https://discuss.bluerobotics.com/t/size-of-o-rings-for-cable-penetrators/2189/4 "2023-02-06T12:20:36Z")
Hi @mmtech, welcome to the forum 🙂 Please refer to the [O-rings section of our Technical Reference](https://bluerobotics.com/learn/technical-reference/#orings-and-seals), as well as the product pages of the products you’re interested in. Feel free to follow up if the information you’re after is not in those places 🙂 ---
**Author:** ![mmtech](https://avatars.discourse-cdn.com/v4/letter/m/2acd7d/32.png) [@mmtech](https://discuss.bluerobotics.com/u/mmtech)\ **Post date:** [February 7, 2023, 7:33pm UTC](https://discuss.bluerobotics.com/t/size-of-o-rings-for-cable-penetrators/2189/5 "2023-02-07T19:33:41Z")
Well, that did not help. I am more confused. It appears what I have is discontinued? Except it’s not? The part I am trying to get spares for are these: > **[Watertight Enclosure End Caps, Domes, and Flange Caps](https://bluerobotics.com/store/watertight-enclosures/locking-series/wte-end-cap-vp/)** > > These acrylic and anodized cap options allow for customization of underwater housings for your application! Rated to up to 950m 2" diameter, part numbers WTE2-M-LOCKING-FLANGE-CAP-BLANK and WTE2-M-LOCKING-FLANGE-CAP-2-HOLE This, [https://bluerobotics.com/store/watertight-enclosures/2-3-4-series/spare-o-ring-set/?attribute\_wte-series=50+mm+(2")](https://bluerobotics.com/store/watertight-enclosures/2-3-4-series/spare-o-ring-set/?attribute_wte-series=50+mm+%282%22%29) by the way, was what I thought was correct, but it says I am using the old end caps? And the link in that page goes nowhere. I think I want a 2-030 70A durometer? Thanks! ---
**Author:** ![EliotBR](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.bluerobotics.com/eliotbr/32/6937_2.png) [@EliotBR](https://discuss.bluerobotics.com/u/EliotBR)\ **Post date:** [February 9, 2023, 12:29pm UTC](https://discuss.bluerobotics.com/t/size-of-o-rings-for-cable-penetrators/2189/6 "2023-02-09T12:29:36Z")
> [@mmtech](#): > > The part I am trying to get spares for are these: > > [https://bluerobotics.com/store/watertight-enclosures/locking-series/wte-end-cap-vp/](https://bluerobotics.com/store/watertight-enclosures/locking-series/wte-end-cap-vp/) > > 2" diameter, part numbers WTE2-M-LOCKING-FLANGE-CAP-BLANK and WTE2-M-LOCKING-FLANGE-CAP-2-HOLE The forum post we’re discussing in is about penetrator o-rings, but your link is for our locking-series enclosure end caps. Are you saying you want O-rings for the products you were asking about originally (that can be installed in the M10 penetrator holes in all of our enclosure end caps, regardless of the enclosure size), or are you asking about O-rings specifically for our 2" enclosure flange (that form the seal between the flange and the enclosure walls)? > [@mmtech](#): > > This, [https://bluerobotics.com/store/watertight-enclosures/2-3-4-series/spare-o-ring-set/?attribute\_wte-series=50+mm+(2")](https://bluerobotics.com/store/watertight-enclosures/2-3-4-series/spare-o-ring-set/?attribute_wte-series=50+mm+%282%22%29) by the way, was what I thought was correct, but it says I am using the old end caps? I’m not sure what you’re saying or asking here. That’s a link to a spare O-ring set for our 2" locking enclosure flange, and it doesn’t say the person reading the page is using anything in particular, it just mentions that the O-rings for the locking series enclosure flanges are not necessarily the same O-rings that are used for the older non-locking series enclosure flanges. > [@mmtech](#): > > And the link in that page goes nowhere. I’m not sure which link you’re referring to - could you copy it here? ---
**Author:** ![DanielG\_BR](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.bluerobotics.com/danielg_br/32/13641_2.png) [@DanielG\_BR](https://discuss.bluerobotics.com/u/DanielG_BR)\ **Post date:** [February 9, 2023, 6:44pm UTC](https://discuss.bluerobotics.com/t/size-of-o-rings-for-cable-penetrators/2189/7 "2023-02-09T18:44:04Z")
Hi @mmtech, If you ever need information about a product, you should start with the technical details section of that product’s page. In the [Watertight Enclosure End Caps, Domes and Flange Caps page](https://bluerobotics.com/store/watertight-enclosures/locking-series/wte-end-cap-vp/) you linked, in the technical details section, you’ll see a table for the flange caps. In that table, you’ll see a column for the radial seal O-ring information, with a [link](https://bluerobotics.com/store/watertight-enclosures/2-3-4-series/spare-o-ring-set/?attribute_wte-series=50+mm+%282%22%29) to the correct replacement O-ring set. Additionally, if you follow the link to the O-ring set, in the technical details on that page you’ll find more information about the O-rings, including the hardness, which is 70A. Hope that helps!