Hi is it possible to fit copper compression fittings to plastic pipe. If so how please

If you are talking about 3/8" compression or 1/2" compression, or even 5/8" compression..then yes it is possible. The only requirement needed is that the plastic pipe gets a brass sleeve inserted into it.

For example, you would slide a compression nut over the platic pipe, then slide the compression sleeve (called a ferrule) on...push up high for now, then insert the brass sleeve inside plastic pipe...pull down ferrule and nut and inset into say compression tee.

Just be sure to buy compression insert sleeves...usually comes in package if you are buying say...a 3/8" compression coupling at the home supply store... or are available for purchase separately.

I assumed this was what you were talking about. Hope this helped. If it did please RATE THE ANSWER by clicking on button below. Thank you.

It's best, although not essential to use plastic ferrule. But, as MP said you need the sleeve.

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Originally Posted by emilyryanemily

hi is it possible to fit copper compression fittings to plastic pipe. if so how please

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That depends on which kind of plastic pipe you're talking about and what the application is.

If you're talking about CPVC, then yes, it is CTS (copper tube size) and a 5/8" compression nut and ferrule will slide over it and tighten -- And as previously mentioned, you should use a plastic ferrule.

If you're talking about Schedule 40 PVC, then no, a compression nut and ferrule will not slide over it.

As for the application, if we're talking about installing a shut off under a sink or toilet, then that's fine -- However, if you're talking about repairing a broken pipe inside of a wall, crawlspace or below ground, then you do not want to use a compression fitting to make the repair -- Concealing a compression fitting is just asking for trouble.