Small holes drilled in sides of overflow

Mel666 · 07/02/2018, 11:48 PM

DH and I got a used 180gl tank with dual overflows. On the sides of each overflow are 4 holes about 1/4" in size. These holes are also on the inner wall of the overflow. These cause the overflow to never empty when the pump is off and causes the sump to overflow. Anyone know what or why those holes may have been drilled for. At this point we are going to plug them up so they don't cause a flood when the power goes out.

billdogg · 07/03/2018, 06:35 AM

No clue what they're for. If it's an acrylic overflow, I would use a piece of acrylic and some Weldon (16 would be great for this) to slap a patch on the inside of the overflow so you can't see the patch. If it's glass, then you could easily get away with just filling the holes with silicone.

JP Reef · 07/03/2018, 07:16 AM

Quote:

Originally Posted by Mel666

DH and I got a used 180gl tank with dual overflows. On the sides of each overflow are 4 holes about 1/4" in size. These holes are also on the inner wall of the overflow. These cause the overflow to never empty when the pump is off and causes the sump to overflow. Anyone know what or why those holes may have been drilled for. At this point we are going to plug them up so they don't cause a flood when the power goes out.

Are they only on one side of each overflow towards each other? If so, someone may have tried to connect the 2 overflows together. You should be able to seal them up with something.

Mel666 · 07/03/2018, 05:25 PM

Thanks for the help.....I'll seal up the holes.

07/02/2018, 11:48 PM	#1
Mel666 Registered Member Join Date: Jul 2018 Location: California Posts: 5	Small holes drilled in sides of overflow DH and I got a used 180gl tank with dual overflows. On the sides of each overflow are 4 holes about 1/4" in size. These holes are also on the inner wall of the overflow. These cause the overflow to never empty when the pump is off and causes the sump to overflow. Anyone know what or why those holes may have been drilled for. At this point we are going to plug them up so they don't cause a flood when the power goes out.

07/03/2018, 06:35 AM	#2
billdogg Registered Member Join Date: Apr 2008 Location: Grove City, Ohio Posts: 10,806	No clue what they're for. If it's an acrylic overflow, I would use a piece of acrylic and some Weldon (16 would be great for this) to slap a patch on the inside of the overflow so you can't see the patch. If it's glass, then you could easily get away with just filling the holes with silicone. __________________ I'll try to be nice if you try to be smarter! I can't help that I grow older, but you can't make me grow up! Current Tank Info: 120 mixed reef with 40b sump, RO 150 skimmer, AI Sol Blue x 2, and a 60g Frag Tank with 100g rubbermaid sump. 2 x Kessil A360w lights, BM curve 5 skimmer

07/03/2018, 05:25 PM	#4
Mel666 Registered Member Join Date: Jul 2018 Location: California Posts: 5	Thanks for the help.....I'll seal up the holes.