I always use plumbers mate on both sides of the fitting.. Never had a problem with it.. I do maintenance on a block if flats and I am removing that type of pop up plug and replacing them with mushroom head type as the concealed types often stick shut after a while with the mushroom head ones they are far easier to remove the plug if the get stuck.
I always use plumbers mate on both sides of the fitting.. Never had a problem with it.. I do maintenance on a block if flats and I am removing that type of pop up plug and replacing them with mushroom head type as the concealed types often stick shut after a while with the mushroom head ones they are far easier to remove the plug if the get stuck.