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
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
