We have the same problem in Australia. I remember a plumber looking at a shut-off valve and saying that no-one had turned it off in 20 years so it’s going to be hard to turn, and will start to leak after we do turn it off.
Newer types have way better longevity so you don’t really need to exercise them.
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the two warm-water-valves in my mietwohnung are stuck.
they recently wanted to replace the zähler, but couldn’t, because they couldn’t stop the water.
now they’re going to send some special guy. well, at least that’s what they said a few months ago 🤔
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We have the same problem in Australia. I remember a plumber looking at a shut-off valve and saying that no-one had turned it off in 20 years so it’s going to be hard to turn, and will start to leak after we do turn it off.
Newer types have way better longevity so you don’t really need to exercise them.