I drilled this 4 times on the sides. I purchased x2 3/4" rainbarrel bulkheads but after installing, I did not like either the seal or the size of the pipe. So the 2nd time around, I used 1" Uniseal & I'm much more satisifed with that diameter. Here's a few pics to help.
Front view (short side):
Here's the Top view of the same holes that drain into the return chamber of the sump:
On the (long) side, I have another pair of drain holes both 3/4" bulkhead & 1" Uniseal:
This is the inside view of the same two holes above:
One of these days I plan to get around to replacing this with a Standpipe design. It won't be a Herbie model as this tank is in our fish room & it doesn't need to be silent. However, because this application is a refugium & flow should be lower, it really doesn't make much noise as it is.
I would use 1 1/2" PVC & Uniseal. The Uniseal is simply amazing. I am using this on our Surge device & would highly recommend over the traditional bulkhead.
Front view (short side):
Here's the Top view of the same holes that drain into the return chamber of the sump:
On the (long) side, I have another pair of drain holes both 3/4" bulkhead & 1" Uniseal:
This is the inside view of the same two holes above:
One of these days I plan to get around to replacing this with a Standpipe design. It won't be a Herbie model as this tank is in our fish room & it doesn't need to be silent. However, because this application is a refugium & flow should be lower, it really doesn't make much noise as it is.
I would use 1 1/2" PVC & Uniseal. The Uniseal is simply amazing. I am using this on our Surge device & would highly recommend over the traditional bulkhead.