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Uniseals and How to Use

Uniseals are a very handy and inexpensive way to put pipe work through fish tanks, filters and grow beds and even your rainwater tanks.  We use them extensively in our aquaculture installations and sell them through our online shop.  The following are some handy tips for their use and a list of pipe sizes suitable along with the hole saw sizes to fit the uniseals correctly. The Uniseals can be used to join one pipe into another at right angles.  However the pipe you are drilling into must be at least twice the diameter of the pipe you are joining into it. (as pictured above) Step 1 – Drilling the Hole It is very important to use the correct hole saw for the size Uniseal you are using (see table below).  Keep in mind most Uniseals have an outer ring diameter of an additional 20mm.  This means to position where you are to put the uniseal allow for the outer lip of the Uniseal.   It is important to make sure where you drill the hole does not have any corrugations like in corrugated water tanks, the seal will not be deep enough to take up the valleys.  I have found (tip from a reader) running your drill in reverse with the hole saw works really well through plastics and stops the teeth from biting, which twists your wrist if you use a high power drill.  My preference is for cordless drills. Once the hole is drilled be sure to remove any burrs on the edge of  the hole, inside and out.  I like to use a deburring tools (plumbers tool) and have been known to use the back of a knife. Step 2 – Inserting the Uniseal While it might seem obvious, be sure to put the seal firmly into the hole with the wide (flanged) side facing the direction you plan to push the pipe through.  See image below. Step 3 – Inserting the Pipe You can chamfer the end of the pipe that you plan to push through the seal.  I find this is only needed with the larger than 50mm pipe.  When we do this we use a stone blade on the bench saw and just rub and angle off the end of the pipe as pictured above.  If you don’t chamfer the end of the pipe off, you must remove any sharp edges from the end of the pipe.  I use the deburring tool for this to also get the burrs off the inside of the pipe or just give the outside a quick rub with some sand paper. Lubing the pipe with soapy water is recommended by the manufacturer.  We use a food grade silicon spray to lube the seal and the pipe.  While the manufacturer does not recommend the use of silicon because it may cause the pipe to lose the seal with the Uniseal under pressure (like pressurized filters).  However, in fish tanks, open tanks and most situations where we have build commercial fish farms, there are no areas where the pipe comes under such pressure to make it fail with the use of silicon.  Up to you, if you have soapy water on hand, I suggest you use that. Leaks (It happens) During weather changes, we have found in winter or colder climates, if you bump the pipe hard when it is cold, the seal can start to drip leak.  It is an easy fix, simply tap the pipe rapidly withe the handle of a screw driver or some thing similar and the seal memory will take up the leak.   If your seal leaks when you install it, this is usually the wrong hole saw size or there is a bit of burr or plastic swathe left between the seal and the hole.  Remove and clean then re-install. Pipe Sizes and Hole Saws If you are not sure what size pipe you have or want to use, measure the outside diameter and select the right seal from the “OD Pipe” column below. Nominal Size Code OD Pipe Hole Saw 15mm Pressure 10102 21.3 32mm 20mm Pressure 10103 26.7 32mm 25mm Pressure 10104 33.5 44mm 32mm Pressure 10105 42.2 51mm 40mm Pressure 10106 48.2 64mm 40mm DWV 10105 43.9 51mm 50mm Pressure 10107 60.3 76mm 50mm DWV 10107-35 55.8 76mm 65mm Pressure 10114 75.3 102mm 65mm DWV 10113 68.9 102mm 80mm Pressure 10108 88.9 102mm 90mm Stormwater 10108 89 102mm 100mm Pressure 10109 114.3 127mm 100mm DWV 10112 110.2 127mm 150mm Pressure 10110 160.3 178mm 150mm DWV 10110-35 160.3 178mm Here is a short video that may also help…

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