At first the controller scared me, but with patience and diligence I am very happy with the result. I installed it on the outside of my radiator and fed power through the flexible wire. If you have two pumps, use a 3/4 inch nut between the block and the radiator. The feed to the thermostat is 3/8 inch. Do not supply low voltage with high voltage. With this block you can check the operation of each element: Fan-Hi; Fang Lo; circulation pump and flushing pump. I found my drain pump wasn't working so I replaced it. It works great!
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