- 1 What is the most common cause of leaking compression fittings?
- 2 How does a compression fitting work?
- 3 Can you use a compression fitting on a plastic pipe?
- 4 Can you use a compression fitting on PEX?
- 5 Why does my compression fitting keep leaking?
- 6 Should you use PTFE tape on compression fittings?
- 7 Should you use Teflon tape on flare fittings?
What is the most common cause of leaking compression fittings?
It is critical to avoid over-tightening the nut or else the integrity of the compression fitting will be compromised by the excessive force. If the nut is overtightened the ferrule will deform improperly causing the joint to fail. Indeed, overtightening is the most common cause of leaks in compression fittings.
How does a compression fitting work?
Compression fittings work by the compression of an ‘olive’ between two tapered surfaces and the pipe itself. This exerts pressure on the olive and bites it onto the pipe. Compression fittings work well if the pipe is clean and cut properly.
Can you use a compression fitting on a plastic pipe?
A compression fitting works in the same way on a plastic pipe as it does on a copper pipe except that you need to put in a liner, which is there to keep the end of the pipe perfectly round.
Can you use a compression fitting on PEX?
Compression fittings for PEX operate in much the same way as compression fittings for copper or other plastic piping. Making the connection involves placing the compression insert inside the end of the PEX tubing, sliding the compression ring over the tubing, then securing it with the compression nut.
Why does my compression fitting keep leaking?
Compression joints are most common on shutoff valves, although you find them on other fittings as well. Also make sure the pipe or tube goes straight into the fitting. Misalignment will cause a leak. If the fitting leaks after you turn on the water, try tightening the nut an additional one-quarter turn.
Should you use PTFE tape on compression fittings?
Can I Use PTFE Tape on Compression Fittings? No. PTFE tape is not designed to seal compression fittings and is ineffective at doing so.
Should you use Teflon tape on flare fittings?
Do not use Teflon ® tape or pipe sealant on any flare ends because you will not obtain a leak-free seal. Keep flare end of fitting free of grease, oil and thread sealant. Use a wrench only on the hex surfaces of the fittings.