This is a Pentair O-Ring replacement for Sta-Rite Cast Iron Suction Trap Assembly Pool Commercial Pump PKG No. 184, 184C, 184E, and 184CE. Inner Diameter: 12-3/4 Inch; Outer Diameter: 13-1/2 Inch; Thickness: 3/8 Inch.
This is the new part number. The old part number is 35505-0421.
