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The flange side (side with the big head on it) part of the bulkhead goes on the inside along with the o-ring. The nut then secures the bulkhead on the outside of the tank. Depending on the material you would use different drill bits. Glass requires a diamond coated drill bit and acrylic a hole saw blade.
The 1/2" bulkhead will work up to 3/4" thickness. Feel free to let us know if you have any further questions.
The plumbing threads on the bulkhead are female, so you would need a male threaded pipe fitting to screw into the threaded bulkheads and then it should work a lot better for you!
It is best to have the flange side on the inside of the tank, so on this particular bulkhead the thread would be on the outside of the tank. For threads on the inside you would want a Thread x Slip.
When measuring for bulkheads, you will need a hole in your tank that is slightly larger than the "C" measurement for the corresponding bulkhead but no larger than the "A" measurement.
Example: If you have a 1.75" diameter hole currently in your tank, then you would want to use the 1" ABS Bulkhead.
1/2" ABS Bulkhead Slip X Thread Dimensions (see diagram)
A - 44mm/1.72"
B - 43mm/ 1.69"
C - 27mm/1.06"
Installation Hole Size - Use our 30mm Diamond Coated Glass Drill Bit for DIY installation
3/4" ABS Bulkhead Slip X Thread Dimensions (see diagram)
A - 52mm/2.04"
B - 50mm/1.98"
C - 34mm/1.33"
Installation Hole Size - Use our 35mm Diamond Coated Glass Drill Bit for DIY installation
1" ABS Bulkhead Slip X Thread Dimensions (see diagram)
A - 68mm/2.67"
B - 63mm/2.48"
C - 42mm/1.65"
Installation Hole Size - Use our 45mm Diamond Coated Glass Drill Bit for DIY installation
1 1/4" ABS Bulkhead Slip X Thread Dimensions (see diagram)
A - 77mm/3.05"
B - 71mm/2.80"
C - 51mm/2.00"
Installation Hole Size - Use our 53mm Diamond Coated Glass Drill Bit for DIY installation
1 1/2" ABS Bulkhead Slip X Thread Dimensions (see diagram)
A - 86mm/3.38"
B - 73mm/2.87"
C - 59mm/2.32"
Installation Hole Size - Use our 60mm Diamond Coated Glass Drill Bit for DIY installation
2" ABS Bulkhead Slip x Thread Dimensions (see diagram)
A - 98mm/3.85"
B - 73mm/2.87"
C - 72mm/2.83"
Installation Hole Size - Use our 75mm Diamond Coated Glass Drill Bit for DIY installation
Good product. By Shawn O on 5/25/2017Shawn O would recommend this product to a friendHaven't used them yet but they seem sturdy. Hopefully there will be no issues.
Good Quality By Ed on 4/15/2017Ed would recommend this product to a friendGood quality ABS bulkheads. If you need something more heavy-duty for your sump try the Sch 80 Bulkheads.
Threaded side is NOT NPT threads and will not properly connect to PVC NPT pipe. By Steve on 1/25/2017Steve wouldn't recommend this product to a friendThe threaded side of this is not threaded for the tapered NPT like one would expect for plumbing pieces. Even with excessive amounts of nylon tape (like suggested by the live chat assistant on their website) the PVC male threads fully into the bulkhead with out tightening until it bottoms out and they still leak a little. Not worth the money and are quite flimsy. Very disappointed.
Bulkhead ABS By William on 11/23/2016William would recommend this product to a friendGreat service exactly as described
Low profile wet side, good seal By don_chuwish on 4/3/2016don_chuwish would recommend this product to a friendPerfect for a 'ghost' overflow external box. Thread on the outside, slip on the inside allows for change. Good quality.
High Quality By B on 1/4/2016B would recommend this product to a friendPurchased several bulkheads from BRS ranging in different sizes and thread/slip. Very pleased. Well built. Never had a leak, but i usually add a small amount of silicone just to be safe. That's my OCD. Tested without silicone and no leaks. I only buy my bulkheads from BRS. If you are looking for a quality bulkhead you will not be disappointed with BRS bulkheads or any of their products. Don't let the price fool you. In this case you get quality at affordable price.
Would recommend By Juken on 11/25/2015Juken would recommend this product to a friendExcellent quality
Solid buy for the price By Deneed4spd on 2/3/2015Deneed4spd would recommend this product to a friendUsed several over couple years and had no issue with leaks, etc. Good bang for the buck.
Great parts! By Jonathan on 1/24/2015Jonathan would recommend this product to a friendI bought these for my tank the other day because my old ones finally gave out after 3 years. These are amazing bulkheads and I will never use any other type.
threads are a little loose fitting By Ken on 1/22/2015Ken would recommend this product to a friendI purchased four of the slip thread bulkheads for my 180 and was surprised that the schedule 40 male adapters from Depot did not snug up as tight as they would have in a schedule 40 female adapter. They screwed in straight to the bottom. I wound Teflon tape around them to tighten the threads a bit. I will update on leaks after I pressurize the returns.
great product By dpoz on 12/3/2014dpoz would recommend this product to a friendThese schedule 80 fitting are great I used them on my 29 gal build and now on my 180 build all the box stores have crap great for the price.
Nothing but trouble By vtecintegra on 9/12/2014vtecintegra wouldn't recommend this product to a friendI can't believe I'm the only one having this problem according to other reviews, but 5 out of 11 threaded on the non-flange side have split at the seam and leaked. I consider myself half way adept being in the hobby for 12 years. Tightened by hand, paste instead of tape, and two 1/2" and three 1" all splitting on the seam. You really can't see the crack until pumping water through. BRS promotes these as better and heavier duty to normal ABS bulkheads? I'd hate to see how a lesser quality bulkhead holds up. You can see the molding line down the center and that's where each one has cracked. IMO they are cheap and asking for trouble. The first three were just an annoyance since they are on my ATS box over the sump, so dripping isn't a show stopper. The fourth though was on my ghost type overflow requiring draining down the tank, disconnecting hoses, and pulling the box to get it out. My fought for trying to save a few bucks. Schedule 80 on my other tank has never caused any problems. I do not recommend buying the threaded on the non-flange side. If you are trying to save a few bucks like my mistake, at least go slip and cement your fitting instead using screw in fittings.