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Old 07-19-2011, 03:52 PM   #1
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Default What size o-ring for 3/8" sight glass and 3/8" compression fitting?

Sorry if this has been posted before, but I have searched for a while and couldn't find the answer. I'm wondering if someone could tell me what size silicone o-rings will work in place of the ferrule in a 3/8" compression fitting when installing a 3/8" sight glass tube.

thanks!

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Old 07-19-2011, 04:13 PM   #2
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See here: http://www.bargainfittings.com/index...product_id=106.

3/8" ID x 1/2" OD

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Old 07-19-2011, 05:51 PM   #3
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Sure, you need a 3/8" ID o-ring to slide onto a 3/8" OD sight glass, but do the o-rings on that website fit and seal when put in a 3/8" compression fitting? I don't see any mention of a compression fitting.

Basically I need whatever size these o-rings are: http://www.bargainfittings.com/index...product_id=117

They say that they are 3/8" ID, but they don't specify what the OD is.

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Old 07-19-2011, 07:04 PM   #4
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You can use the nylon ferrule.

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Old 07-19-2011, 07:09 PM   #5
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Quote:
Originally Posted by kevink View Post
Sure, you need a 3/8" ID o-ring to slide onto a 3/8" OD sight glass, but do the o-rings on that website fit and seal when put in a 3/8" compression fitting? I don't see any mention of a compression fitting.

Basically I need whatever size these o-rings are: http://www.bargainfittings.com/index...product_id=117

They say that they are 3/8" ID, but they don't specify what the OD is.
If you look at their o-ring page http://www.bargainfittings.com/index...product_id=106 it's gotta be the 3/8" ID x 1/2" OD. Also just eyeballing the picture the thickness of the ring looks to be about 1/6 of the ID or 1/16", so I'm comfortable asserting 1/2" OD.

Edit: Alternatively, I'd be hard pressed to find an instance where Bobby gave bad advice.
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Old 07-19-2011, 08:04 PM   #6
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Quote:
Originally Posted by Bobby_M View Post
You can use the nylon ferrule.
I would, but mine came with a metal ferrule, so I need something else. If I think the 1/2" OD o-ring will fit inside of my compression fitting, I'll get some of those 3/8 x 1/2" o-rings and see how it works out. Didn't you used to sell sight glass kits with silicone o-rings for sealing in the compression fitting? If so, did you use 3/8" x 1/2"?
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Old 07-19-2011, 08:08 PM   #7
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What I'm saying is that you can grab a nylon replacement ferrule at home depot or Lowes to avoid ordering silicone orings.

If you want the orings, I'm pretty sure I used -010, 1/4" ID x 3/8" OD stretched over the 3/8 tubing. If you measure the ID of the compression nut, I think you'll find that a 1/2" OD oring won't make it.

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Old 07-19-2011, 08:20 PM   #8
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Bobby,
That is exactly what I kind of suspected. Thank you so much. I did not know that you could buy just a nylon ferrule by itself, so that little tid bit is also much appreciated! Thanks for the great idea!

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Old 07-19-2011, 09:41 PM   #9
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The oring sized 3/8" Tube - 3/8" ID x 1/2" OD is what we ship with our sight gauge kits.

A nylon ferrule will work as well.

I just checked on this and it looks like the Anderson Metals brand (model 00560-06) ferrule is made with Delrin Plastic and has a melting point of 347
I'll probably test these and start stocking them.

Looks like watts brand is also made of Delrin. Working temp goes to 250 degrees on both brands

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Old 07-20-2011, 03:31 PM   #10
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Thanks, BargainFittings.

I picked up the Delrin ferrules at Home Depot because it was easy, although I'm going to get some o-rings from you when I place an order for some other stuff to see how I like them. I am surprised that they are 1/2" OD, though. The inside of my compression nut measures exactly 0.500", but the opening of the tapered part of the fitting (where the ferrule would normally reside) measures quite a bit less than 0.500"... something around 0.450" if I remember correctly. Have you ever noticed that an o-ring got sliced by the sharp edge on the top of the tapered surface after you took a sight glass apart? It's probably not an issue...

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