Flow sensors Flow Category/type
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![Dwyer HFO-21123 In-line flow alarm | range 4-23 SCFM air | 1/4" female NPT. | Blackhawk Supply](http://blackhawksupply.com/cdn/shop/files/hfo_front_1000x1000_3889c611-efe5-450f-8dc3-1c6e6f296fc7_medium.gif?v=1719999169)
HFO-21123 | In-line flow alarm | range 4-23 SCFM air | 1 / 4" female NPT. | Dwyer
Brand: Dwyer
SKU: HFO-21123
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![Dwyer DS-400-20 Flow sensor | 20" pipe size. | Blackhawk Supply](http://blackhawksupply.com/cdn/shop/files/ds_family_1000x1000_fd60b0c6-11d9-4a69-b604-785c3fdc019c_medium.jpg?v=1719999159)
DS-400-20 | Flow sensor | 20" pipe size. | Dwyer
Brand: Dwyer
SKU: DS-400-20
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![Dwyer HFO-22320 In-line flow alarm | range 2-20 GPM (7.5-75 LPM) water | 3/4" female NPT. | Blackhawk Supply](http://blackhawksupply.com/cdn/shop/files/hfo_front_1000x1000_f123fca4-1e35-4fa4-820a-a083ceb972bc_medium.gif?v=1719999149)
HFO-22320 | In-line flow alarm | range 2-20 GPM (7.5-75 LPM) water | 3 / 4" female NPT. | Dwyer
Brand: Dwyer
SKU: HFO-22320
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![Dwyer HFB-2-05 In-line flow monitor | 1/2" female NPT | 0.5-5 GPM (1-19 LPM) water. | Blackhawk Supply](http://blackhawksupply.com/cdn/shop/files/hf_600x600_888a9c87-429c-476a-be47-8c3831ea0440_medium.gif?v=1719999145)
HFB-2-05 | In-line flow monitor | 1 / 2" female NPT | 0.5-5 GPM (1-19 LPM) water. | Dwyer
Brand: Dwyer
SKU: HFB-2-05
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