How to tell sand filter size?

[tensec10]

I'm trying to find a replacement part for my sand filter. The parts are all listed in size / inches. How do I tell what size my filter is?

The part is discountinued / obsolete Pentair 55025200. Any insight into what the replacement part would be would be a HUGE help, but mainly just trying to determine how do I know if I have a 30" or 26" filter?

Thanks in advance!

 

[mas985]

This says it is 26":

Pentair Obsolete - Standpipe Assembly F/26" W/laterals (55025200) - INYOPools.com

55025200 - STANDPIPE ASSEMBLY F/26" W/LATERALS (55025200)

www.inyopools.com

I take it there is no label on the filter itself?

 

[JamesW]

Circumference = π × diameter.

A 26" diameter will have a circumference of about 82".

A 30" diameter will have a circumference of about 94".

 

[tensec10]

Thanks James. I didn't know what the 26" value was a measurement of.