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I just replaced the batteries on my 507 flow through sensors. You just remove 2 very small Philips screws and replace the coin battery. I can't remember the number, but something like CR1632. Always check the o-ring when changing the batteries.
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Jim & Martha Abernathy
2014 Montana 3402RL Level UP, Sailun S637's, TST 507, 500W solar
2014 Ram 3500 Laramie® 4x2 diesel dually crew-cab 3.73 axle, Reese R20
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