Model Number: FSF20-G3/4 Brand Name: FENSHEN Key Specifications/Special Features: FSFseriesflowswitchesareusedinmeasuringand controllingtheflow oftheliquidin thepipe,such aswater,alcohol, and more, aswell intheplaceswhereitneedschaineffectorcutoutprotectionFSFseriesflowswitches haveSPDTswitch, full-sealingstructure asitsshell, andstainlesssteel asitsinside components,whichcan assureits useinanyconditionsFSF-Aseriesflowswitchesare usedforcaustic fluidliquid,the materialsofFSF-A incontactwith themediumisstainlesssteelApprovals: 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 10 ZG3/8 2.4~2.9 2.1~2.6 R134a, R22, R407C, R404A/507 water and oil brass FSF10W-1/2 10 1/2"ODF FSF15-ZG1/2 15 ZG1/2 3.3~4.0 2.9~3.7 FSF15W-5/8 15 5/8"ODF FSF20-G3/4 20 G3/4 6.6~8.8 6.2~7.7 FSF20W-7/8 20 7/8"ODF FSF25W-9/8 25 1-1/8"ODF 13.0~16.1 11.4~14.7 FSF20W-9/8A 20 1-1/8"ODF 6.6~8.8 6.2~7.7 R717(ammonia)system stainless steel