R007101643:piston seal for our prep hplc

Hi! 

I just wonder if there is a good replacement for R007101643, a piston seal for our Agilent prep hplc.

I have placed the part last October but it has not been shipped yet due to the part being obsolete.

I am using a replacement from ASI (200-1222) but the shape is a bit different, leading to the pumps producing erratic flow rates. 

Could you please give an advice on that?

Thank you!

Best,

Joonseok

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