Can this be used to hook up to a 240 v transformer?

No, this unit is for low voltage used with 24vac transformer

I have order this twice and both times it came without the harness, why is that?

what harness? the electrical coupler cable thingy? mine came with

If the switch and pump where to loose power while the pump was running and the valve was open would the valve be able to close?

The Solenoid Valve is normally-closed. So if it loses power it shuts off automatically.

What is the specific type/model of electrical plug used on this? I want to verify it fits the electrical plugs on the Aquatec pump.

Yes it does it perfectly fits aquatec pumps.

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Description

This is an electronic shutoff switch kit for the Aquatec booster pumps includes the ESO and the wiring harness. This switch connects to your incoming water line on your RO system and shuts off water to your system when your pump shuts off. This prevents unnecessary waste water from being produced, and s the auto shutoff valve in systems with a pump. The ESO features 1/4 quot; quick connect fittings. This must be used with a TSO switch. (See quot;Related Products quot;) Product Features ESO Kit Kit includes both the ESO and the wiring harness. ESO The ESO automatically turns the water supply off and on to your reverse osmosis system. This saves you time and water. Wiring quot;Y quot; Harness The wiring quot;Y quot; harness is required to connect the ESO to the Aquatec booster pump and transformer. 1/4 quot; Quick Connect The ESO features 1/4 quot; quick connect fittings for quick amp; simple connection. Aquatec Pumps The ESO works with both the Aquatec CDP 6800 amp; 8800 booster pumps. Requires TSO It is required that the ESO be used with the TSO (tank shut off) switch. If the ESO is used alone, it will remain closed and no water will get to your system. (See quot;Related Products quot;) Requires Wiring Harness The ESO requires the wiring harness to connect to the transformer and the booster pump. (See quot;Related Products quot;) Product Description This is an electronic shutoff switch for the Aquatec booster pumps used in RO systems with a tank. This switch connects to your incoming water line on your RO system and shuts off water to your system when your pump shuts off. This prevents unnecessary waste water from being produced, and s the auto shutoff valve in

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