TST 507 sensor question
I've got the TST 507 system, about 5 years old and it works fine. I want to replace the little valve stem seals in the sensor (where it seals against the valve stem) and my question is; how do you ge...
Forum Discussion
loggenrock wrote:
Those extra O-rings are replacement for the battery caps - you just need to really stretch them out. I never saw spare O-rings to go INSIDE the part that goes on the valve stem... ST
Yes, I know what you're talking about, the little o-rings that you stretch way out to seal the screw-on battery cap; I've got those covered.
The one I'm talking about is the seal that you will see if you take the sensor off and look into the valve stem hole. It's not easy to see, they flatten out, but the they do eventually crack and need to be replaced or you will have a leak. If you look at the replacement parts you should have gotten with your 507, the valve stem seals look more like a thick black plastic washer with a square shoulder, maybe 1/4" in outside diameter. I was expecting an o-ring but that's not what they use to seal this area.
