How to Connect Compression Fittings

What You'll Need

Compression fittings use pressure built up in a plumbing system made up of a mixture of the compression nut, compression seat and compression nut. These three combined create a connection within the system. Some connections you find when associated with plumbing can be hard to connect or remove. However, with this type it can easily be taken apart. A general rule take into account is that when you take a connection of this type apart, they you cannot use the fitting again. The way in which you connect this particular fitting has a major effect on the seal and how easily it is to take apart in the future.

Step 1 – Turn off the Water Valve

Initially before you can start the process of connecting compression fittings you need to turn off the water valve that is relevant to the work you are undertaking. Once the water value is shut you should begin to take apart the compression fitting. Ensure that you put the compression nut and sleeve to one side in a safe place so as not to lose them. You will need these two items soon.

Step 2 – Position the Compression Nut over the Pipe

Take the compression nut that you have placed to one side and ease it carefully over the pipe at the top end that you will be using to push into the fitting. You should ensure that the threads are in the direction of the end of the pipe. If you don’t do this, the nut will not be on properly.

Step 3 – Move the Compression Sleeve on to the End of the Pipe

Once the nut is in place you should then position the compression sleeve on the end of the pipe as well to prevent the nut slipping off. From the edge of the pipe and the edge of the sleeve there should be about a ¼-inch gap.

Step 4 – Apply Plumber’s Grease

Using the acid brush you should cover the threads of the compression seat with grease, ensuring that there is enough on there. However, it’s important to ensure that the grease does not accumulate in the opening of the seat.

Step 5 – Move the Pipe into the Compression Seat

As soon as grease has been applied, you should push the end of pipe so that it goes into the compression seat. Once you have achieved this, ensure that you pull the compression nut towards the seat. The next step is to thread the nut on to the seat. This will in turn make sure that the pipe is correctly positioned.

Step 6 – Tighten the Compression Nut

Using the wrench, ensure that the compression nut is tight enough without being too tight so you can’t get it off again. If the nut is on too tight then this could result in the pipe being damaged which would ultimately cause a leak in the connection.

Step 7 – Test the Connection

Once all the steps have been followed, the final step is to turn the water back on again and test out the connection to make sure it works correctly. If there is a leak, make the nut tighter ever so slightly to seal the connection again.