DBSF Flow Switch is designed to prove liquid flow in a wide variety  industrial applications. The corrosion resistant flow switch is mounted in a weatherproof box for simple wiring connections. Stainless Steel vane is field trimmable for 1" and larger pipes and is  coupled to the SPDT switch to prevent liquid from entering the switch housing.  NPT 1" fitting
Liquids: Sea water, chilled water, brine, ethylene glycol, etc.

DBSF  (NEMA 4, IP65 Enclosure) are for 1" and larger pipe. They are furnished with a bronze paddle in three segments for pipe 1" .Paddle segments may be removed or trimmed as needed.
Pipe connection brass NPT 1 inch
Stainless Steel vane V4A
Max Liquid Pressure 160 PSI ( 1103 kPa) 
Waterproof construction
Field adjustable for 1" and larger pipes
SPDT snap-acting switch 10 Amp. @ 250 VAC
Operating temperatures - 40 to 248°F  ( - 20 to 120 C )