Need help with intex manual!

26 is the o-ring for the bottom of the plunger valve. 28 is the step washer. If you scroll down further it shows the same plunger valve diagram with the filter information. They are number 22 and 23 in that image. 27 is the "nut" for attaching the plunger valve to the pool wall fitting. It is not designed to come off, so if that part is missing you will need to replace the plunger valve.
 
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