Model Number: FSF20W-9/8A Brand Name: FENSHEN Key Specifications/Special Features: FSF series flow switches are used in measuring and controlling the flow of the liquid in the pipe, such as water, alcohol, and more as well in the places where it needschaineffectorcutoutprotectionFSF series flow switches have SPDT switch, full-sealing structure as its shell, and stainless steel as its inside components, which can assure its use in anyconditionsFSF-A series flow switches are used for caustic fluid liquid, the materials of FSF-A in contactwiththemediumisstainlesssteelApproves: CQC (China),CE(Europe) ModelDN(mm)Connection size(inch) flow rate range(L/min) medium materials in contact with the medium increasing flow decreasing flow FSF10-ZG3/8 Φ10 ZG3/8 2.4-2.9 2.1-2.6 R134a, R22, R407C, R404A/507 water and oil Brass FSF10W-1/2 Φ10 1/2"ODF FSF15-ZG1/2 Φ15 ZG1/2 3.3-4.0 2.9-3.7 FSF15W-5/8 Φ15 5/8"ODF FSF20-G3/4 Φ20 G3/4 6.6-8.8 6.2-7.7 FSF20W-7/8 Φ20 7/8"ODF FSF25W-9/8 Φ25 1-1/8"ODF 13.0-16.1 11.4-14.7 FSF20W-9/8A Φ20 1-1/8"ODF 6.6-8.8 6.2-7.7 R717 (ammonia) system stainless steel