Description A.Y. McDonald Pressure Switch 30-50 PSI w/Pulsation Plug Pressure Switch with Pulsation Plug Baker pressure switch with pulsation plug provides reliable automatic pump control with built-in surge dampening for longer switch life. Factory preset at 30-50 PSI with easy field adjustment using the top-cover screws — each full turn changes the setting by 2 PSI. NEMA 1 enclosure with captive nut design keeps internal components protected from dust and moisture. 1/4" female NPT pipe connection fits standard residential and light commercial water system plumbing. Pulsation plug on the inlet absorbs pressure spikes from pump cycling, preventing premature contact wear and nuisance tripping. Individually boxed with adjustment instructions printed inside the cover for quick installation. Shop Watermain Supply for pressure switches, tanks, and complete pump control solutions with fast delivery. Datasheets Sump Pump Accessories Guide
