Red sea filter cup question

[Doberman13]

I was planning on building a filter sock holder for my new sump. Drilled my first 4" hole in the acrylic and realized the hole is just a little bit too big. It looks like I would need a 3.75" hole saw.


For those of you with red sea filter cups, is the lip around the top the same size as filter socks or is it a little larger? It looks like it from the pictures online but I can't find any definitive answers.

 

[york1]

About the same, cup almost looks a hair smaller but that may just be my eyesight

 

[civics14]

Did you need to buy some cups? I have 4x for sale.

 

[snarky shark]

From what I've read on people switching to cups they have had to cut the ring off a filter sock to use to make a better seal. Hope that helps.

Sent from my SM-N975U using Tapatalk

 

[wake125122]

The redsea cups are slightly smaller. If you order a generic one from anyone else they should be 4". It is redsea attempt to keep you buying their specific stuff kinda like how apple does.

 

[Cook]

My red sea cup is 3.96" in diameter including the lip. The flange looks like about 0.2" My average filter sock width including the lip is 4.130", a Red sea sock is right at 4". I don't have a RS tank anymore or I would measure the hole for you though I am sure it will be metric.

 

[Doberman13]

Thanks for your replies. I went ahead and put it all together and I'll deal with it once I get the cups. I may need a 3d printed ring for them to sit on but we'll figure that out before I get water in the tank.