I have 2 of the old kayatank timers. They are well built with everything dipped into a rubber mold so that there is nothing that will corrode. The cycle runs 3 seconds on, 17 seconds off. Good for if you run a 12Vv battery to a 12V pump. I would go out for 2 -3 days fishing on the same battery charge when I used these timers. Little green on the tips of the wires, but cut off about an inch and it'll be good again.
$15 Each
Will ship at your expense
Located in Brea
626-665-4657
fish4steve@gmail.com