Hey im curious is the panworld ps 200 supposed to have a rubber o ring? It seems mine doesn't. Is this part of the desighn or did i get a pump without an o ring?
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Thank you. And never too old with good info! I noticed the o ring when i cleaned it i guess it needed time to unflatten.This thread is a little old but yes there should be a large (thin) O-ring between parts #1 and #4. It is a "seal free" pump because the motor shaft does not run through the entire pump (which would require a seal to prevent leaking). These pumps are driven by magnetism.

