How much rise is required to activate switch?

Switch activation needs to be measured in Degrees not rise. The rise is directionaly proportional to the length of power cord attached to the switch from where it is tethered. The longer the cord, the more the rise. To answer you question, I would say somewhere between a 45 and 60 Degree angle will make or break the connection.

I am using a 12v dc pump and don't have 120/240v at the cabin. will this work on a 12v dc system?

This pump controller will work effectively on a 12v solar array to power a Dankoff Slow pump. The model 1308 will run efficiently on a 150-200 watt solar panel.

Is it drinking water safe? Using for fish tank. Want to be always on unless water is too low then shut off. Will this work?

I use ours on our home water storage tanks. There's really nothing that could contaminate anything. It's just a hard plastic case and an extension cord. No different than most aquarium devices. If your using it for a aquarium topoff than I would not recommend it though as it has to rise / fall quite a bit to turn on/off. You can control that by how long the cord to the float is but I would say minimum of 3". My tanks drop about 18" before it turns on. There are many ato devices out there like the jbj auto top off that work excellent for fish tanks. It's what I use on my 280g. Hope that helps

If I am filling a stock tank, will this switch shut off when the tank gets full?

Absolutely. I installed our float switch in our 3000 gallon water storage tank. As soon as the water reaches the desired level it will turn off the magnetic contactor that controls the submersible pump. You will have to make adjustments to the weight to achieve the desired level of water in the tank.

ASIN	B00A9GDIQ8
Batteries Included?	No
Batteries Required?	No
Best Sellers Rank	#306,522 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #408 in Water Pump Accessories
Control Method	Touch
Customer Reviews	4.4 4.4 out of 5 stars (109)
Date First Available	November 18, 2012
Is Discontinued By Manufacturer	No
Item Package Quantity	1
Item Weight	1.63 pounds
Item model number	FSK-6
Manufacturer	G&W
Mounting Type	Floor Mount
Part Number	FSK-6
Product Dimensions	5 x 8 x 1.5 inches
Sensor Technology	Contact Sensor
UPC	662425059058

BRODY Automatic Float Switch Water Tank Level Sensor on/off control with 10' Cable Sump Pump

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