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Old 07-17-2021, 04:21 PM   #1
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TST Sensor O Rings

I'm changing batteries on all my sensors so I need to find the O Rings that go on the internal part of the sensor just above where the battery goes. Any thoughts as to where I can purchase these??
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Old 07-17-2021, 04:33 PM   #2
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TST has them in stock at reasonable prices.
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Old 07-17-2021, 09:16 PM   #3
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Did you break one? I changed out a battery, and the O ring seemed still in good shape.
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Old 07-17-2021, 10:17 PM   #4
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TST has them in stock at reasonable prices.
Insane prices is more like it.

Try the Danco #30 o-rings from Home Depot. $2.57 for 10.
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Old 07-18-2021, 10:22 AM   #5
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Every time I change batteries, the O-rings just fall apart.
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Old 07-18-2021, 10:52 AM   #6
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Every time I change batteries, the O-rings just fall apart.
I change my batteries and O-rings once a year and my o-rings also fall apart. I just buy the kit from TST, as there are two pieces, the o-ring and the inner grommet. For me, the kit insures that I get the correct diameter and thickness of o-ring.
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Old 07-18-2021, 11:27 AM   #7
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Originally Posted by Jkwilson1989 View Post
Insane prices is more like it.

Try the Danco #30 o-rings from Home Depot. $2.57 for 10.
Did these work okay?
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Old 07-18-2021, 04:04 PM   #8
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Did these work okay?
I tried the #30 but when I screw the cap on the O Ring pops out a little. So I tried the #35 and it doesn't pop out. I bought these and will be using them on all the sensors that might need new O Rings.
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Old 07-18-2021, 08:02 PM   #9
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The proper size O Ring for the cap sensors is 11mm x 1mm Nitrile. You can find them on ebay for very little. TST charges way to much for them and will not sell in bulk.
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Old 07-18-2021, 09:35 PM   #10
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I tried the #30 but when I screw the cap on the O Ring pops out a little. So I tried the #35 and it doesn't pop out. I bought these and will be using them on all the sensors that might need new O Rings.
I've not tried the #35, but will keep them in mind. I put some silicone O-ring lube on mine before tightening and didn't have a problem, but if the 35s are easier I'll give them a shot.
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Old 07-18-2021, 09:55 PM   #11
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O-ring size

Sorry for the newbie question. The 1x11mm nitrile size. Is the 11mm the ID or OD.
Thanks.
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Old 07-19-2021, 08:17 AM   #12
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Sorry for the newbie question. The 1x11mm nitrile size. Is the 11mm the ID or OD.
Thanks.
11mm OD, cross section is 1 mm.
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Old 07-19-2021, 11:12 AM   #13
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11mm OD, cross section is 1 mm.
Iím pretty sure o-ring common sizes are ID, not OD.
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Old 07-19-2021, 01:59 PM   #14
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I’m pretty sure o-ring common sizes are ID, not OD.
My notes on my stash say 11 mm OD. I am on the road for the next month and don't have a caliper with me to measure to confirm one way or the other. The vendor I purchased from shows 11x1 mm they did not designate ID or OD. They match up exactly with the ones purchased from TST.
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