Pentair 273550 Manual Air Relief Assembly Replacement for DE Pool and Spa Filter

Manual air relief assembly replacement for pool and spa DE filters Monitors air pressure and displays when pool filter needs cleaning Model number: 273550 Fits Pentair Nautilus Plus DE filter models: NSP-24, NSP-36, NSP-48, NSP-60, and NSP-72 Also fits Pentair FNS, SM, and SMBW 4000 series DE filter models: FNSP24, FNSP36, FNSP48, and FNSP60 Color: Black Manufacturer warranty: 1-year warranty