waste compression

Hey Everyone, I have been researching this and I am a bit confused on how to terminate the macerator waste, into a normal plastic soil stack I have in my loft. I fully understand that the waste has to be solvent weld because of the pressure, so how do I terminate it correctly to the plastic...

What's the best way to ensure a watertight fit connecting a 38mm European / continental waste pipe to a 40mm UK compression waste fitting without using a 38mm to 40mm adaptor prior? The reason not to use an adaptor is because there is no space. Note, a 40mm compression fitting on a 38mm pipe...