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If you're going to buy a new elbow,you will see if it's a push fit or not i think it is  so warm the pipe gently by friction  Get a strip of Hessian or rough cloth and loop it round the pipe and pull it backward and forward to create the heat ,this softens the pipe and and makes it more durable to pull off

With this fitting you push the fitting on and pull back to lock and seal, to remove you push back on and hold the central collar in while you pull back and off.

Trouble is sometimes the metal teeth that do the gripping can dig into the Carvers soft plastic fitting in the water heater, this can make it very difficult to hold the central collar in so it won't release. Also that coloured end cap can stop you holding the collar in, I've broke them off before now so to get directly at the collar.