what sock fits trigger 26 sapphire sump?

[FishPersonFL]

'regular' socks have too large diamater. Which will fit?
sump is here: https://www.bulkreefsupply.com/sapphire-sump-26-trigger-systems.html
TIA

 

[reeferpat137]

Should be a 4"sock

 

[Fish_Fry]

Confirming, 4 inch socks. I have the same sump.

 

[vetteguy53081]

I had this sump and was 4"