Help identifying pool filter

[Wapoloe]

I'm a new pool owner and I noticed that when I vacuum the pool the waste returns to the pool. With a little research I discovered that I need a new spider gasket due to a a bad multi-port. The issue that is am not able to ID my pool filer because it has been weathered. Can any you help me id the filter so I can purchase a new spider gasket? or do need to purchase a new multi-port.

Edit: Also my filter is diameter 19.5 and is 22 " tall

 

[ajw22]

This is an AGP sand filter?

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