Apex FS-25 Flow Sensor 1/4″ FS-25 Usually used with a return pump, this flow sensor can be placed in line with the flow on any pipe, connected to the FMM, and communicate to your Apex the flow rate of water through that pipe or tubing. The FS-25 comes with 1/4″ push connect tubing that will work with any standard style 1/4″ RO/DI tubing. What’s Included?1x 1/4″ Flow Sensor with push connect fittings
