JG Speedfit Plastic Push-Fit Pipe Inserts 15mm 10 Pack (64318)

Yes with the right insert. The ones with the small lip.

I recently took apart a compression joint that was attached to a plastic pipe that had a brass olive. It’s been there for approximately 20 years without problem. The only issue is that when I tried to turn the valve off, the valve itself started to leak! Ideally you should use copper, but if you have already done it then you should be okay.

No, this type of insert is specifically for plastic pipe going into a metal compression fitting with an olive. This insert strengthens the pipe to prevent it being crushed by the olive/fitting. If all fittings are JG speedfit push fit plastic type then only the regular insert with rubber seals is required. Hope this helps.

No. You must only use the inserts made for each brand of pipe inside that brand of pipe. Speedfit inserts are only for Speedfit pipe, and Hep20 inserts are only for Hep20 pipe.

No inserts are required in copper pipe. For full installation instructions, visit the Speedfit website. Read how to properly install the Speedfit system first before attempting any installation. Incorrect installation is the only reason that pushfit systems fail.