In need of obscure DE filter parts list: Andrews Advantage

[gbski]

Hi all! Am hoping the tfp forum can help out once again... I have a 36 sf stainless steel DE filter manufactured by Andrews Advantage probably original to the pool build about 21 years ago. No model or serial can be read off the unit. I am in need of a parts list or diagram. Specifically I am trying to determine what part number is the main o ring. Normally my parts match up with the pentair nautilus but not in this case. I have scoured the pool stores to find a match to no avail. Best I can tell the o ring is 3/8" thick x 18 5/16" inside diameter. Does anyone have experience with this filter and can shed any light?

Thanks for reading.

PS_ I did communicate with Pentair who seems to have bought AA and didn't get very far with them

 

[kimkats]

Can you take the old o-ring out? If so take it down to a store and match it up. Lowes or autoparts should do the trick.

Kim

 

[gbski]

h.d. does not have 18" x 3x8" o rings. I have taken the o ring up to the pool stores and compared to everything they have in stock including nautilus plus. Even tried installing both of those and they don't fit.