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Part # R172009
Dimensions 4" L x 4" W x 0.25" D
Alternate Part #'s O-283V
Rainbow Lid O-ring
I have other parts to order for the 320 Chlorine feeder
You can view the Rainbow 320 parts diagram for further part searchs. You can also type into our search engine Rainbow 320 then scroll down on it's page until you see the replacement parts link.