McDonnell & Miller FS4-3 1 In. NPT Flow Switch PN 114400 NIB
Connection: 1″ NPT Threaded. Switch Type: SPDT (Single Pole, Double Throw). Complete Kit: Includes the switch assembly, cover, and the full set of four stainless steel paddles (1″, 2″, 3″, and 6″) to fit various pipe sizes.