- OM2500 HOB Overflow Box - Skimz
Max Flow - 660 GPH
Skimz External Overflow Boxes are a great addition for tanks that do not currently have a drain system. Adding a sump to a tank is super easy with the Skimz OM2500, just place the hang on back overflow box onto the edge of your aquarium, and using 1 1/4" soft vinyl tubing you can plumb the box to a sump. The durso style valve lets you fine tune the overflows drain rate, making it completely silent.
- Removable Weir
- Durso Style Drain System
- Compatible with Aqua Lifters
- Integrated Priming Nipple
- Leveling System
External overflow boxes give you the ability to add a sump or added filtration to your aquarium without the complication of drilling your existing aquarium. On many ocassions we have set up tanks and then a few months after decide to add a sump. With an established tank, drilling and plumbing the aquarium isn't really an option. All HOB overflow boxes work off a siphon principal, pulling water out of your aquarium, over the edge and the directed into a bulkhead that is included with the OM2500.
Noise of a large concern for all types of overflows and the OM2500 uses a durso style wedge pipe that allows you to tune the drain flow by just turning the wedge pipe until the noise stops. We do not recommend using DC return pumps with overflow boxes since they have variable flow, and once the overflow box is tuned the return pumps flow rate should not be increased.
Note - We highly recommend using an Aqua Lifter pump to prime the overflow box continuously. The Aqua Lifter pumps are a cheap insurance policy against siphon restriction through the overflow box.
Max Flow - 660 GPH
Max Tank Thickness - 2"
Dimensions - 7.28" L x 7.28" W x 9.50" H
Water Intake External Dimensions - 7.28" L x 1.5" W x 4.5" H (height is variable for leveling)
Minimum Clearance Required Behind Aquarium - 5"
Plumbing Connection - 1 1/4" Soft Tubing (we recommend braided vinyl tubing)
1x OM2500 Overflow Box
1x Removable Weir
1x Priming Tube
1x Priming Tube Valve
1x Drain Valve Assembly
3x Leveling Screws
Works Exceedingly Well By Mike N on 6/7/2019Mike N would recommend this product to a friendThis HOB overflow works very well. I've had it running for about 6 months now with zero issues. It isn't very loud and can go a long time before needing cleaning. I've cleaned it once in 6 months. I have the aqualifter on it as well for peace of mind. No complaints and I'm about to buy a 2nd for another tank I just setup.
Poor assembly, multiple seam leaks. Frustrating, no peace of mind. By Laura on 2/27/2019Laura wouldn't recommend this product to a friendI should’ve bought a different box. I did get a partial refund but still not worth the cost, especially when converted into CAD from USD. Straight to it, the problems I encountered;
1. First the little was cheap and broke in half so I had to break the rest off and drill the plastic into a new hole to super glue then silicone the tube directly in. Annoying but minor.
2. Then the outside box that is supposed to hold water before going down the tube, leaked a few drops a second along the middle left back corner, so I had to disconnect it from my pipes, I ran a bead of silicone inside to help, the used a acrylic weld glue substitute on the outside trying to shove as much in the seam as possible. Then ran a bunch along the outside to kinda melt it further just in case. Because yeah, that DEFINITELY gives me peace of mind... So, I let that dry for a few days. But I needed to get my sump connected soon...
3. Then it was super noisy and after a week of gurgling and the air and water constantly getting pulled out by the aqualifter, there was hardly any flow and the only thing keeping the siphon was the aqualifter, which makes bubble and vibration sounds unless for a few seconds it’s pulling only water. Annoying. I couldn’t figure out why there was always air in the top of the overflow U. It definitely was not running silent like it claims. So after a week of running it on my tank, vibration louder than everything else and bubble water sounds that put me on edge whenever the sound changed making me think water was splashing on the floor, I noticed salt starting to collect along the top left seam! Ah-ha! An air leak in the most important spot on something that only runs a siphon if it is air tight. Seriously guys, you don’t even test it? I pressed my finger on it and everything worked and ran silent! Wow.... 5 stars my ass.
Now I need to glue that area and maybe silicone it too. Visually it’s a mess. And it looked so sleek out of box. Hopefully that works.
4. White was a stupid choice, guys. I ended up painting the tank side black. This was a minor thing too. But wait, there’s more.
5. Also, if you have a normal tank that has a black plastic standard rim and isn’t drilled (hence the need for an overflow, which is probably what most people who can’t drill have because they’re cheaper), the box is very wide to sit over it, which is good but probably overkill because it makes it to fat to fit between the tank and wall, a minor inconvenience, but the fail here is that it doesn’t lower further, so the water is about an inch higher in the tank than I’m used to. I worry about the waves going over the edge 1 inch above, or splashing under the rim. It can be raised buy the dumb plastic turn screws but not lowered... why? Even on rimless it would be too high.
This thing has been nothing but hell. I can fix the seam leak issues but I can never have total peace of mind that it won’t leak again. But I hope that when I fix this air leak that it finally runs properly and SILENTLY.
I bought this over the other ones because it says 5 star and the others’ comments said they were noisy, and this one was quiet, plus the brand name Skimz was one I heard I could trust.
So yeah, don’t buy this, it will likely be made fast and assembled poorly.
Amazingly SILENT overflow box!! By Kneppnasty on 5/3/2017Kneppnasty would recommend this product to a friendAfter having decided to run my new tank as a peninsula configuration, I didn't want to drill it and be forever stuck that way.....
So I used a CPR CS-90 continuous siphon overflow on my tank for the past 1.5 years with few complaints. Since I happen to have a Skimz sump and protein skimmer, I have seen pics of these Skimz overflows on the internet for quite a while now....but nobody in the US seemed to be selling them.....Until BRS recently started carrying them.
Sooo I figured that I would order one and give it a shot....
Let me tell you- I've had it running on my tank for a few weeks now and I TOTALLY LOVE IT.
It runs dead silent and without a single hiccup, especially compared to the CPR overflows.
The removable weir feature is totally clutch, because it was a royal pain to scrub clean when permanently connected like the CPR overflows.
I simply cannot get over the noise reduction since switching to this overflow, it's incredible! And not only does it feature an adjustable flow rate, there is a built in silencer inside the adjustment tube, exactly like a protein skimmer air intake silencer. (Def makes a difference!)
The only little thing I have noticed is that the 1/4" plastic elbow going into the top of the unit (used for priming) sticks down into the overflow cavity about 1/8" and is not flush with the top/inside the same way it is with the CPR overflows. This results in a small air pocket accumulation inside the unit that constantly remains there because the aqua lifter pump will start drawing up water before all of the air pocket is sucked out. It seemed like this would cause an issue and result in lost siphon eventually....however it HAS NOT resulted in any issues whatsoever. So maybe Skimz did this on purpose for some reason? Not sure, but regardless, it has performed above and beyond my expectations and I would highly recommend these overflows to anybody not looking to drill their tank and make permanent alterations.
Nice work Skimz! Thanks for another quality product!