Bulk Reef Supply

Uniseal Bulkheads

Grouped product items
1/2” Uniseal

SKU: 202900

In stock

$1.99 $1.99

- +
3/4” Uniseal

SKU: 202901

In stock

$1.99 $1.99

- +
1” Uniseal

SKU: 202902

In stock

$2.99 $2.99

- +
1 1/4” Uniseal

SKU: 400600

In stock

$2.99 $2.99

- +
1 1/2” Uniseal

SKU: 202903

In stock

$2.99 $2.99

- +
2” Uniseal

SKU: 202904

In stock

$3.99 $3.99

- +
3" Uniseal

SKU: 207974

In stock

$4.99 $4.99

- +
4" Uniseal

SKU: 207975

In stock

$5.99 $5.99

- +
6" Uniseal

SKU: 207976

In stock

Discontinued by Bulk Reef Supply
$7.64 $8.99

- +

Why does BRS recommend this?

Uniseals are one of the secrets in life you wish you knew about years ago.  By conforming to round surfaces they allow you to plumb directly into 5 gallon buckets, brute trash cans, or any round surface.  They accept standard Sch. 40 or Sch. 80 PVC and allow DIY projects that once may have been very costly to complete much more affordable.

Uniseals are used to attach pipe to just about any container in situation where bulkheads will not work. The most common use is on curved surfaces such as storage drums, buckets or even other pipe.


Uniseal Specs:

½” Uniseal

  • Fits our Schedule 80 ½” pipe
  • Pipe ID – ½"
  • Hole saw size: 1 ¼” or 31.7mm (32mm)


¾” Uniseal

  • Fits our schedule 80 ¾” pipe
  • Pipe ID – ¾”
  • Holesaw size: 1 ¼” or 31.7mm (32mm)


1” Uniseal

  • Fits our schedule 80 1" pipe
  • Pipe ID - 1"
  • Holesaw size: 1 ¾” or 44mm


1¼” Uniseal

  • Fits our schedule 80 1¼” pipe
  • Pipe ID - 1¼”
  • Hole saw size: 2” or 50.8mm


1½” Uniseal

  • Fits our schedule 80 1½” pipe
  • Pipe ID - 1 ½”
  • Hole saw size: 2½” or 64mm


2” Uniseal

  • Fits our schedule 80 2" pipe
  • Pipe ID - 2"
  • Holesaw size: 3" or 76mm


3” Uniseal

  • Pipe ID - 3"
  • Holesaw size: 4" or 102mm


4” Uniseal

  • Pipe ID - 4"
  • Holesaw size: 5" or 127mm


6” Uniseal

  • Pipe ID - 6"
  • Holesaw size: 7" or 177.8mm


Uniseal Installation Instructions

More Information
PVC Connection Type Slip
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Product Questions

Witch uniseal will go into a schedule 40 1" pvc pipe. I am building the inline heater from he king of diy's YouTube channel.
Question by: Bryce Coats on Jun 8, 2017, 12:11 PM
Our fittings are based on the nominal pvc rating, so for 1" ID pvc pipe, you'll want to select the 1" uniseal.

Have a great day!
Answer by: Zack on Jun 13, 2017, 9:54 PM
If I were making a prob holder for my sump would a probe fit into the 1/2" uniseal?
Question by: John Hendrickson on May 20, 2017, 1:47 PM
Hey there,
I'm afraid the probes are a bit too small and would not be able to seal with a 1/2" Uniseal.

Answer by: Zack on May 22, 2017, 5:09 PM
Are the prices listed, per uniseal? Or do these come in a package? If so, how many?
Question by: Larry C on Aug 16, 2016, 3:02 PM
Great question! The price is per each individual uniseal. :-) Thanks!
Answer by: Randy on Aug 16, 2016, 6:14 PM
If the OD of a 3/4" pvc is slightly over 1", you still use a 3/4" uniseal? I shouldn't bump up to a 1"?? Thanks for any info.
Question by: brian matthews on Jul 27, 2016, 7:41 AM
Hi there,
When it comes to PVC the best thing to do is take your tape measure and throw it away. PVC is nominal sizing and just because it says its ¾” you most likely will not find an exact ¾” dimension anywhere on the pipe. If your PVC is ¾” you will want to use a ¾” Uniseal, along with all other fittings and valves.
Answer by: Charlie on Jul 27, 2016, 8:45 AM
How thick can the wall material be? Can it be used on two walls like attaching an external overflow (similar to a ghost overflow)?
Question by: Aharon on Feb 10, 2016, 9:26 AM
Great question!
We do not recommend using a uniseal on anything wider than 1/4-5/16". Feel free to let us know if you have any further questions!
Answer by: Connor on Feb 10, 2016, 12:23 PM
I am planning to use uniseals for my ATO, mixing, and water change tanks. What can I use for lubrication on the pipe that won't contaminate the water?
Question by: David on Aug 13, 2014, 5:32 AM
Hi David,

In the past I have actually just used water or saliva but many people recommend things like silicone o-ring lubricant, non-ammonia windex and vegetable oil. Just give the container a good rinse after everything is installed and you should be good to go!

Hope this helps!
Have a great day :)
Answer by: Bulk Reef Supply on Aug 13, 2014, 5:32 AM
Will they work with schedule 40 pipe?
If so, what diameter pipe for a 1 inch uniseal
Question by: chris on Aug 3, 2014, 9:03 AM
Hi Chris,
Yes. All plumbing is sized with nominal plumbing sizes which takes into account the correct size fittings for the pipe regardless of whether they are sch40, 80, etc. For a 1" pipe you would want a 1" uniseal.
Answer by: Bulk Reef Supply on Aug 3, 2014, 9:03 AM
Can a uni seal be reused? i need to pull the pipe out and install a longer one.
Destin, Fl.
Question by: Jack on Mar 17, 2014, 11:42 AM
Hi Jack,
That is just fine. Just be careful removing it to not rip or tear on the uniseal and you will be just fine.
Answer by: Bulk Reef Supply on Mar 17, 2014, 11:42 AM
Will it work with tubings?
Question by: Paul on Feb 27, 2014, 3:28 PM
Hi Paul,
The uniseals are made to work with pipe. The diameter of the pipe pushes out and is what seals against the walls of the uniseal. A flexible tube would most likely leak.
Answer by: Bulk Reef Supply on Feb 27, 2014, 3:28 PM