New 75 drilled center overflow hole sizes

atwinparadox2 · 08/31/2009, 09:24 AM

Ok, so I picked up a 75 gallon reef ready tank over the weekend and it's the first drilled tank I've had that i didn't do myself. In the overflow there are two hole obviously, but they are different sizes. One is 1 3/4" and the other is 1 1/2 I believe. Now, which hole size do i use for the drain and which size do I use for the return?

Thanks for your help!

Craig-

h8z2luze · 08/31/2009, 09:57 AM

Mine has 2 different sizes too I believe and though I have not plumbed it yet and this is my first drilled tank I have been told that the larger one is for the return and the smaller for the drain. Dont take my word on it though that is just what I have been told. My durso is installed in one side and the other side is open and the open side is 1 3/4" like yours. I did not take the durso out to see what size that hole is but im guessing its smaller from what I hear its a normal occurrence.

08/31/2009, 09:24 AM	#1
atwinparadox2 Registered Member Join Date: Mar 2006 Location: Kingston, PA Posts: 782	New 75 drilled center overflow hole sizes Ok, so I picked up a 75 gallon reef ready tank over the weekend and it's the first drilled tank I've had that i didn't do myself. In the overflow there are two hole obviously, but they are different sizes. One is 1 3/4" and the other is 1 1/2 I believe. Now, which hole size do i use for the drain and which size do I use for the return? Thanks for your help! Craig- __________________ \| begin each day as if it were on purpose \| when in doubt, remove all doubt \| Current Tank Info: \| 90 Gallon Main display, 2/175 MH, 2 actinic, 20 sump w/20 fuge, about to dabble with a algae scrub screen \|\| 75 in the works \|\|

08/31/2009, 09:57 AM	#2
h8z2luze Registered Member Join Date: Nov 2007 Location: Nor*Cal Posts: 134	Mine has 2 different sizes too I believe and though I have not plumbed it yet and this is my first drilled tank I have been told that the larger one is for the return and the smaller for the drain. Dont take my word on it though that is just what I have been told. My durso is installed in one side and the other side is open and the open side is 1 3/4" like yours. I did not take the durso out to see what size that hole is but im guessing its smaller from what I hear its a normal occurrence.