... ) Medium: R134a, R22, R407C, R404A/507, Water and oil 3) Material: Brass Oil Flow Switch FSF series :FSF20W- 3/4 Magnetic flow ... current: 1AAvailable medium: R134a, R22, R407C, R404A/R507, oil and mixture of oil and refrigerant. Type data ModelConnection size(inch)Flow rate ... ~8.86.2~7.7R717(ammonia) systemStainless Steel ModelConnection size(A)Dimension (mm)Length(L)Height(H)FSF10-G3/8G3/850112FSF10W ...