Part # 5111-21
Manufacturer Code 135
Dimensions 2-1/8" OD; 1-15/16" ID
Alternate Part #'s 3081039, HAY1012006, O128, SP1500W, SPX1500W
O-ring most commonly used as the pot to volute o-ring for Hayward PowerFlo series and Leslie's Hydramax above ground pool pumps.
Also used on the elbow assembly for the Hayward Perflex EC65 and EC75 filters.
Also used as the pressure gauge o-ring on the Hayward XStream filter.