@Battuta wrote:

My only concern is whether the (metal) compression fittings on the CW268 will work on the Whale plastic piping that is designed for push connections. Can you clarify this for me?

There are inserts available for use with plastic pipe in compression fittings. You insert one inside the plastic pipe to stop it being crushed in the fitting. I used them on the 2 plastic pipes visible in the photo above. I’m not sure what they are called but if you explain the requirement to your plumber’s merchant or chandler they should be able to find the necessary.

Good luck.