McDonnell & Miller

120611 McDonnell & Miller FS251 Flow Switch With NEMA 1 Enclosure

(No reviews yet) Write a Review
This Item Usually Ships The Same Day!
Calculated at Checkout


McDonnell & Miller FS251 General Purpose Flow Switch With NEMA 1 Enclosure 120611, Replaces FS4-3.



  • Universal design serves the widest variety of applications For starting or stopping electrically operated equipment such as signal lights, alarms, motors, automatic burners, metering devices and others
  • Replacement for common flow switches from Johnson/Penn, Potter/Taco, Watts, Hydro level and other manufacturers
  • 1" NPTM Pipe Connection
  • Sensitivity adjusting screw makes flow adjustment easy
  • Single pole, double throw snap switch
  • EPDM O-ring sealed
  • Four stainless steel paddles included
  • 1", 2", 3" & 6" (25, 50, 80, & 150mm)
  • Minimum temperature (fluid or ambient) 32 Deg. F (0 Deg. C)
  • Maximum temperature 250 Deg F (121 Deg. C)
  • Maximum pressure 160 psi (11.2 kg/cm2)
  • Models:FS251 - NEMA1 enclosure, FS254 - NEMA4 enclosure

This Item Usually Ships The Same Day!

View AllClose

Warranty Information

Warranty: Quoted prices include standard factory warranties. Warranty requires install, start-up and operation as per the manufacturers IOM. Job Site Assistance: By Others Start-Up: By Others Commissioning: By Others: These services, if a project requires start up, they are responsibility of contractor or commissioning agent. Owner training assistance, as outlined in any equipment specifications the responsible of the commissioning agent. Clarifications & Exclusions 'ALTERNATES' are offered for consideration and will always be subject to the engineer's and owners approval. Excludes any seismic calculations or supports, coatings other than factory standard. Terms: prices are quoted are "each" (unless stated otherwise) and FOB point of origin with no freight allowed freight ships via common ground carrier, and inside continental US Only - any special shipping requirements to be responsibility of purchaser. We offer all prices less tax, with a validity of 30 days from the date quoted and all sales are final. Once items have shipped and left the warehouse National Pump Supply is not responsible for any damage caused during the shipping process. You must contact the shipper directly and file a claim with the shipping company. Lead Time: All prices offered are based on standard factory lead times (or) as stated within quotation. Expedited shipments may be available at an additional charge. Contact your Sales Engineer for the ETA of any specific equipment on any order or quotation.
View AllClose