Oil Flow Switch FSF series : 1) Connection: 3/4"ODF 2) Medium: R134a, R22, R407C, ... , Water and oil 3) Material: Brass Oil Flow Switch FSF series :FSF20W- 3/4 Magnetic flow switch is mainly used to ... , R407C, R404A/R507, oil and mixture of oil and refrigerant. Type data ModelConnection size(inch)Flow rate range(L/min)Medium ... /43/4” ODF148FSF25W-9/81” ODF194 Oil Flow Switch FSF series