Do you have more info? I saw Adam from Battle Corals with something similar on his reactor but for some reason I thought it was to help diffuse the co2
Yes I learnt it from adam . You can get them here
https://www.eeuroparts.com/Parts/165432/Fuel-Filter-H102WK/
If adam with 7000 gallons if acroporas don't need a masterflex don't think I do