shitty float valve.

They now make water cutoff valves that use a smart/wireless sensor. Not cheap but design for whole-house, could be applied as plan B for a float valve. I've spaced leaving my RO water running as well and was so glad I had a float valve - but seeing yours fail now has me thinking about mine as it's going on several years old.

Also most of the modern smart-home systems/alarms have water and freeze sensors - i.e. Ring or ZWave based products, etc.

I use these to alert my phone of leaks

i use a doberman battery powered sensor you lay on the floor 5$