I believe the O-rings are 2 inch for their unions, but you could contact Discount Salt Pools to confirm. They carry them because I had them send me some before.
As Texas Splash stated, DSP does sell the O-rings, but I wanted to find an independent source, so tried two different sizes and I found that 4x62 is the correct size, and Viton is a good O-ring material for chlorine.
The actual size is:
62mm ID
70mm OD
4mm width
They are available on Amazon for $2.40 each (5 for $11.99)
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