Bulkheads are used to attach plumbing to aquariums and sumps to allow water to flow through them. These low profile reef safe bulkheads are made from black ABS plastic. Our supplier manufactures these slightly thicker than competitor aquarium bulkheads making them more reliable.
Bulkheads come in different sizes and either with or without threads for plumbing to connect to. With threaded bulkheads, you will need to use a male pipe thread to screw into the bulkhead to make a connection. Slip fittings will require a solvent to bond the bulkhead to the plumbing permanently.
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. (see image)
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 Thread 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 Thread 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 Thread 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 Thread 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 Thread 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 Thread 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
Product Questions
We would not attempt to drill again if the hole is 3/4" in the acrylic you can use the smaller size bulkhead. Schedule 80 and ABS do not have a difference on most tanks and we recommend ABS as it is a more universal size however Sch. 80 is rated for higher pressures.
75G display + 20G sump. Do you recommend a different pump? Thank you.
We recommend at least 2 overflow drains coming down with two 1" drain lines. additionally larger drains can work up to 1.5" drain lines. The 4000 pump will work great on that system!
You did buy the correct size however the only flaw is that you are attempting to thread onto the outside threads of the bulkhead. Unfortunately nothing threads onto the outside threads of the bulkhead except the nut. All plumbing will be glued or (male threaded) on the inside diameter of the bulkhead. If the inside of your bulkhead is smooth you will need a Spigot x Barb fitting to be glued in (If it is threaded on the inside diameter you can use male NPT x Barb. I have included the links below.
https://www.bulkreefsupply.com/gray-male-pipe-adapter-spigot-x-barb.html
Or:
https://www.bulkreefsupply.com/schedule-80-straight-barb-x-male-thread-1-4b880d619bbbcbbea22b13bfa30a1ace.html
Schedule 80 threads will work great with an ABS bulkhead. You will want to ensure that plumbers or Teflon Tape is used to ensure a water proof seal. Feel free to let us know if you have any further questions!
If you have a threaded fitting then a 3/4" male threaded and 1" male threaded fitting would go into the 3/4" and 1" bulkheads respectively.
A slip fitting is one that you insert a pipe into and then glue. A threaded fitting is one that has threads and is screwed together with another threaded fitting. A pipe wont go into a threaded fitting and vice versa so which bulkhead you get really depends on what type of fitting you plan to connect to it. If for example you want a threaded strainer on one side and a threaded barb connection on the other, a thread x thread bulkhead would be what your looking for.
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