glow worm hot water connection pipe, easy to replace?

[Petewxm]

Hello,
Can anyone help, I have a leak on my boiler, which looks like its coming from the nut on the hotwater connection pipe. My question is - Is it easy to replace, looks like one end just push fits and the other is just tighten the nut? Empty the system first?

Thanks Pete

 

[cross thread]

Sure its not a fibre washer that needs replacing