I'll add this which is the response I got from Michael Hall
Quote:
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We (Aqua Digital) personally recommend that float sensors are changed every two years when in use due to the harsh nature they are working in. However sensors unused need to be carefully checked for any degradation prior to use,(cable gone hard, actuator stuck in on position, cat chewed the cable) for these reasons the manufacturer can not assure reliability, If they could then warranties would start from time of use not time of purchase. So we advise caution when using such stored parts and would go as far as saying do not store critical parts for later use. One obvious reason would be if it turned out to be faulty your warranty would have expired.
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