Uniseal Rubber Pipe to Tank Seal Uniseal is simply the world's best seal. It's flexible rubber and quick and simple to install: After cutting a hole in the wall of a tank or other surface, the seal is inserted. Then the PVC pipe is coated with a slippery detergent (i.e. dish soap) and pushed into the seal. Uniseal products replace traditional plumbing hardware with a single injection moulded unit requiring no component parts. It was designed to solve many of the issues of pipe to tank connections. For many industries pipe to tank seals are traditionally among the most complex connections to manufacture. Traditional seals require multiple parts such as, rigid flanges, bolts, washers, o-rings, along with long assembly times and high production costs. The Du Pont Alcryn is the key to the liquid-tight seal. When the pipe is pushed through the rubber-like Uniseal from the outside, the inside Alcryn wall becomes thin enough to allow the pipe to squeeze through and then forms a liquid-tight seal. The coefficient of friction with the plastic pipe is roughly three times higher than any other material which allows it to create a better seal than with any other material. In static conditions the seal is good up to 65 PSI. Uniseal can withstand pressure, and suction, acids, oils, greases, gasoline, sewage, waste, heat and cold. It offers long life, easy installation and reduced labour and material costs. For the Uniseal 20mm ( inch) you need to drill a 31.75mm (1 inch) hole. Uniseal Installation Instructions - Cut hole with holesaw to the size indicated. Take care as lower quality plastics may crack. - Ensure that the hole is clean with no burrs. Irregular holes may cause leaks. - Insert the Uniseal with the wide surface facing out. - Make certain the pipe to be inserted is cut clean and square at the end. Sand the edges so there are no rough or sharp edges to cut the surface of the Uniseal. - Use soap or lube on the pipe to be inserted. Insert the pipe into the uniseal as far as needed to clear the inside of the seal by about 20mm. The lubricant will be squeezed off of the pipe as it passes through the Uniseal. - Some force may be required ie. use a mallet. Take care not to damage the wall or the inside of the uniseal with too much force. Uniseal Pipe and Hole Saw Guide - Here is a list of the uniseal sizes Aqua Gardening stocks, and the relevant hole saw sizes in metric and imperial measures. All of the pipe sizes listed are for PVC Pressure Pipe*, except for DWV 50mm and 100mm, and also 89/90mm uniseals are only suitable for 90mm Stormwater pipe. To double check your pipe, the correct pipe outer diameters (OD) are also dhown on this table: Pipe Size and Type - Cat #Pipe outside Diameter (OD) Hole Saw Size5mm/ 3/16" Pressure Pipe 2U0186.4mm0.25"8mm1/3"6mm/ 1/4" Pressure Pipe 2U0259.5mm0.37"13mm1/2"10mm/ 3/8" Pressure Pipe 2U03817.10.67"25mm1"15mm/ 1/2" Pressure Pipe 2U05021.3mm0.84"32mm1.25"20mm/ 3/4" Pressure Pipe2U07526.6mm1.05"32mm1.25"25mm/ 1" Pressure Pipe2U10033.4mm1.315"44mm1.75"32mm/ 1 1/4" Pressure Pipe2U12542.1mm1.66"51mm2"40mm/ 1 1/2" Pressure Pipe2U15048.2mm1.9"64mm2.5"50mm/ 2" Pressure Pipe2U20060.3mm2.375"76mm3"50mm/ 2" Drain Pipe (DWV)2U200-3555.3mm2.16"76mm3"90mm/ 3" Stormwater Pipe2U30089mm3.5"102mm4"100mm/ 4" Pressure Pipe2U400114.3mm4.5"127mm5"100mm/ 4" Drain Pipe (DWV)2U400-35110mm4.29"127mm5" *Tolerance +/- 1mm*Tolerance +/- 0.032*Tolerance +/- 2mm*Tolerance +/- 0.062 What's the Diff between DWV and Pressure Pipes? White Poly Pipes come in different grades, and DWV and Pressure types plumbing pipes are used for different purposes. DWV is generally used for rainwater or waste water, with the pipes not coming under pressure. This pipe is often more brittle and less thick as pressure pipe, so it is a little more prone to cracking. PVC Pressure pipe is the higher quality of the two types of PVC pipes, and it is used are residential housing to reticulate the water fed from the mains water system. PVC Pressure pipe is of higher quality and accepted for use with potable water.