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The F61 flow switch is designed for use on liquid lines using water, ethylene glycol solutions, or other liquids not injurious to the brass and phosphor bronze parts that come in contact with the liquid.
Stainless steel paddle is of three segments for use in pipes from 1" to 3" diameter.
F61KB11 and F61MB1 include a 6" paddle for pipes 4" to 6".