Uniseal Value Packs

Uniseal tank fittings

Uniseal fittings are a great inexpensive alternative to using bulkhead fittings. Can plumb round tanks.

The Value packs are designed to let you get the most for your money by sizing the packages to fit in USPS Flat Rate shipping options. I always shake my head when some one orders just one or two of the smallest fittings and they are paying more for the postage than they paid for the fittings and then a week or two later they order a few more. So with this product I am essentially suggesting How many of any one size I can easily fit into a flat rate envelope.

If you still want to order smaller numbers of uniseals, you can do so on the Uniseal page.

Plumbing through tank walls is made much easier and less expensive using a Uniseal®. Unlike bulkhead fittings a Uniseals can handle slight irregularities or curvatures without leaking. With a sturdy backing, a Uniseal® can even be plumbed through liner.

Bulkhead fittings often have limited connection options and force the use of extra threaded fittings to connect the pipes. Bulkhead fittings usually cost more than Uniseals.

Instructions for installing Uniseals

  • Cut hole to the proper size for the Uniseal you are using.
  • Insure that the hole is clean cut with no sharp edges. Irregularities could cause poor sealing and ultimate leakage.
  • Insert the Uniseal into the hole with the wide side facing the pipe to be inserted.
  • Make certain that the pipe end to be inserted is clean cut. sand the edges so that there are no sharp points.
  • Using rubbing alcohol or slimy water, lubricate the outside of the pipe end to be inserted (the manufacturer recommends detergent and even Aquatic Eco systems says windex but both these could be bad for the fish so I usually just use water or rubbing alcohol since it will evaporate,) then push the pipe through the Uniseal from the large flange side. The co-efficient of friction of the rubber holds the pipe tightly in place.

I have found that using a T on the end of the pipe being pushed through provides a good handle to push against since pushing the pipe through a Uniseal® is the only difficult part about the whole procedure. Make sure before deciding to use a Uniseal® that you will have the space and angle/leverage to push the pipe though and that the hole will have enough clear space around for the flange of the Uniseal® to seat properly (don’t drill the hole too tightly into a corner.)

Uniseal installed

Uniseal installed

A Uniseal® can even be plumbed into a pipe, but the pipe having the Uniseal® hole cut in it must be enough larger than the Uniseal® being installed that it will still seal properly.

Uniseals are made for low pressure applications and if you are putting any mechanical pressure against the pipe that is going into a uniseal it could cause leaking, make sure your pipes are adequately supported and you are not torquing things too much to get it all to fit (I do like the rubber couplers used near a uniseal to give a little extra play and not require “perfect” angles to make things fit nice.)

Sizes listed are the pipe sizes the Uniseal® work with. For Example, if you are using 1″ Schedule 40 pipe or PVC drinking water pipe, then you want the 1″ uniseal. I also list the size hole saw needed to cut the proper hole for each size uniseal.

1/2″ Uniseal® $1.80 each ($1.57 each when you buy a ten pack) 3/4″ Uniseal® $1.85 each ($1.58 each when you buy a ten pack) 1″ Uniseal® $2.00 each 1 1/4″ Uniseal® $2.27 each
(1.25″ holesaw size) (1.25″ holesaw size) (1.75″ holesaw size) (2″ holesaw size)
1 1/2″ Uniseal® $2.57 each 2″ Uniseal® $4.30 each 3″ Uniseal® $5.34 each 4″ Uniseal® $6.72 each
(2.5″ holesaw size) (3″ holesaw size) (4″ holesaw size) (5″ holesaw size)
6″ Uniseal® $9.95 each
(7″ holesaw size)


Pipe sizes listed are the “Nominal” pipe sizes that match the Schedule 40 PVC Outside Diameter here in the USA where the Uniseals are made. The “Nominal” size does not indicate the outside diameter of the pipe. Pipe sizes are NOT the same world wide. While it seems the pipe sizes in the USA and Australia are compatible some parts of Europe are NOT and I do not know where else. Please do some research into pipe sizes before ordering. I do not refund the shipping or pay for the return shipping on uniseals since it normally costs more to ship them than it costs for the parts themselves.

22 comments to Uniseal Value Packs

  • Dave

    I need 20- 3″ uniseals – Can you please send me a good holiday deal, thank you

    • TCLynx

      I’m already selling the Uniseals about as inexpensively as I can afford to.
      But if you are in the united states, the shipping on 20, 3″ uniseals is reasonable enough since I can fit them into a USPS Medium Flat Rate Box and if paypal overcharges you on the shipping, I will refund the difference.

  • BD

    I am in Israel and our pipes have different measurements. Can you tell me what outside diameter pipes I can use? For example, I want to use something that has 2 inch od. What uniseal do I use? So too, 1.5 inch od?

    • TCLynx

      The Uniseals are made to work with the standard size PVC pipes here in the USA. I don’t know what the pipe sizes are in Israel.
      Here is a list of the pipe sizes by nominal listing with the actual O.D. outside diameter. In Inches
      Nominal O.D.
      1/2 – .840

      3/4 – 1.050

      1 – 1.315

      1-1/4 – 1.660

      1-1/2 – 1.900

      2 – 2.375

      3 – 3.500

      4 – 4.500

  • Charlie

    When will you have the 1.5 uniseals in stock?

  • Mark

    Can you give me a quote on 1/2 value packs of 3/4″,1″,1 1/4″. Does that equal 1 1/2 packs? I am just getting started and could use the help.

  • B

    Love the seals!!

    Love the service!!

    ALL GOOD!!!

  • B

    which european countries have disimilar pipe sizes?

    pipe bought in asia has been snug!

    • TCLynx

      I don’t know, I don’t have the funds to go on a European trip to check it out.

      Snug is actually good, it should actually be fairly difficult to push the pipe into the uniseal, the bigger sizes the harder it is to install them, smaller sizes are not that difficult.

      • B

        Have had 5 out of 12 seals spring a leak after nearly a year of use.

        Seems they dont like being moved around at all after being set in place for a time.

        • B

          sorry, nearly 2 years of use!!

        • TCLynx

          no bulkhead fitting is designed to handle lots of torking or pressure against the pipe, especially the uniseals which depend on the pressure of the pipe pushing the uniseal against the tank wall for it’s seal. All plastics will become less flexible with age and sun light exposure.

  • B

    Snug is very good!

    Over a year with no leaks!

    I went through SO MUCH silicon over the years ‘fixing’ dripping bulkheads, what a waste of so many hours and so much money!

    not to mention the prolonged stress!

  • […] (appropriate numbers of uniseals to fit in a flat rate envelope for shipping) please check out the Uniseal Value Pack Page Sizes listed are for the “Nominal” USA PVC pipe size. For more info on PVC pipe sizes […]

  • Brian

    Do you know when you’ll get 2″ unseals value packs back in?

    I would want 4 packs.

  • Brian H

    Can we “prepay” for the 2″ unseals and get them sooner? I need 1 6-pack of them.

  • Stepane

    Are you still selling uniseals? If so do you ship to Canada. I’m in need of 20 – 1-1/2″ uniseals. Postal code L9M 1N8. Thanks

    • TCLynx

      Oh Sorry I didn’t see this comment till just now. Yes I do still have some 1 1/2″ uniseals and I can ship to Canada. I will send you an e-mail to get details for a shipping quote.

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