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 ... 2~2.9R134a,R22,R407C,R404A/R507,water and oilBrassFSF10W-1/23/8”ODFFSF15-G1/2G1/23.3~4.02. ... /2G1/250FSF15W-1/21/2” ODF113FSF20-G3/4G3/450FSF20W-3/43/4” ODF148FSF25W-9/81” ODF194 Oil Flow Switch FSF series