The Pentair 273513 O-Ring for Air Bleeder is a replacement part designed for Pentair Nautilus and Nautilus Plus pool/spa D.E. filter models NS24, NS36, NS48, NS60, NS72, NSP-24, NSP-36, NSP-48, NSP-60, and NSP-72. It is also compatible with Pentair FNS pool and spa D.E. filter models FNS 24, FNS 36, FNS 48, and FNS 60, as well as Pentair Triton C C-3 TR100C and TR140C pool/spa sand filters. This O-ring has a dimension of 0.5 x 0.5 x 0.25 inches and weighs 0.010 lbs. It is a genuine Pentair product with the SKU JTLN1515.
