Pentair 273550 Manual Air Relief Assembly Replacement Pool and Spa D.E. Filter
This manual air relief assembly is designed to use with Pentair Nautilus Plus pool/spa D.E. filter models NSP-24, NSP-36, NSP-48, NSP-60, NSP-72 and also compatible with Pentair FNS, SM & SMBW 4000 Series pool/spa D.E. filter models FNS 24, FNS 36, FNS 48, FNS 60, 4060.