Pentair Air Relief Valve with Pressure Gauge 98209800Pentair Air Relief Valve 98209800 Air Relief Valve with Pressure Gauge for the following Pentair Filters: Clean and Clear Plus Filters Clean and ClearFilters Easy Clean D. E. Filters PredatorFilters Clean and Clear RPFilters Quad D. EFilters FNS PlusFilters SM and SMBW 4000 Series Filters (manufactured after 1999) Separation Tank Sta Rite Posi Clear Filters Sta Rite Posi Clear RP Filters Pentair 98209800