TST 507 parts are expensive.
I decided I should replace the batteries in my TST 507 sensors. In the past I have found that the O rings can not be reused as I had a couple break during assembly last time I replaced the batteri...
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I've had outstanding customer service from TST. I called when I needed a couple screws for the anti-theft caps and they sent me a package of screws, extra caps, o rings for the valve stem connection and o rings for the battery cap--- all free of charge. I have enough to last a long time
