Pentair Black Manual Air Relief Assembly | SM & SMBW 4000 Series D.E. Filter, FNS Filter, Nautilus Plus Filter | 273550Z Transformers Contains powder pillow reagents and

Contains powder pillow reagents and testing vial

Replace drain cover every five years from the date of installation

Cost effective repairs

When replacing the pump lid

Snap-adapt handle

Pentair Black Manual Air Relief Assembly | SM & SMBW 4000 Series D.E. Filter, FNS Filter, Nautilus Plus Filter | 273550Z Transformers Contains powder pillow reagents andOEM Replacement Manual Air Relief Assembly for Pentair D. E. and Cartridge Filters The Pentair Black Manual Air Relief Assembly (273550Z) is the OEM replacement air relief assembly for the SM and SMBW 4000 Series D. E. Filter, FNS Filter, and Nautilus Plus Filter product lines. IMPORTANT: CONFIRM COLOR BEFORE ORDERING This is the BLACK version of the air relief assembly. Pentair produces this assembly in multiple color variants for different filter