Response to Hi Tom, this O-ring 10" ID, 1/4" (O-240) - 449 will be a perfect replacement for the seal plate o-ring on your Sta-Rite Dura-Glas / Max-E-Glas pump.  That o-ring started its life perfectly round, but the sealing surfaces flattened it out over the years.  Adding a little lubricant to it when you replace it will ensure it seals up perfectly and lasts a long time.  

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