How large are 4" filter sock holes?

[Trever]

Are they 4" diameter?

I'm having a glass guy make my baffles and he'll drill the hole for a filter sock in one of the panes. When I measure the diameter on my filter socks, it seems like 4" might be a hair large.

 

[fuelman]

Are they 4" diameter?

I'm having a glass guy make my baffles and he'll drill the hole for a filter sock in one of the panes. When I measure the diameter on my filter socks, it seems like 4" might be a hair large.

Looks like 95mm should be spot on.

 

[Trever]

@fuelman nice!

 

[JosephM]

I drilled using a 100mm drill bit and it works

 

[jradishness]

I had my glass guy cut it 4” and it was too big. If the socks stayed centered, they’d hold, but if it slid sideways at all, it would fall through. I had to run a bead of silicone on the inside of the hole to hold the socks snug and centered.

 

[Trever]

@jradishness why I'm asking such a simple question! :)

 

[Trever]

I did a new search with the information provided above by responders and found this posting on another fish board:

Found drawing on Marine Depot where filter sock holder was 3.75" or 95mm to hold 4" filter sock.

 

[rob taft]

The ones in my Pro Clear Red Flex are 3 3/4" ID.

 

[Trever]

I'm hearing a consensus:

3.75" (95mm equivalent)

 

[Trever]

... and just went and re-measured my socks, the 3.75" (95mm) is looking just right.

 

[vetteguy53081]

3 3/4"