Hi, Sorry to open up an old thread but i have the same problem on a late model, i have a seized union in the old slave that i cant get out and need a replacement. Ive clicked on the links that Ian provided above but they dont work on the new Brickwerks site. Ive been to the site and im not sure what parts i need to buy. Can i buy just the union or can you buy the pipe already connected with unions?

this is the union/pipe that needs replacing. Any help would be fantasic, thankyou.