Gems 155425 is a RotorFlow® liquid flow switch with polypropylene body and 1/4" FNPT connection, flow range 0.5–5 GPM, 24VDC supply, SPDT relay output, LED indication and adjustable setpoint, rated 6.9 bar and -29–82°C, designed for reliable flow monitoring and no-flow protection in cooling systems of semiconductor, laser, medical and welding equipment.