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I should also say that the outer sealing packings used to be made of compressed granulated cork. Whilst this is impervious to water, glycol antifreeze seems to be able to come through it very easily, forming a white crust on the outside of the joint, which removes the red paint off the barrel, and turns the metal rusty. So if you can get some, use the black rubber outer packings as this doesn’t let antifreeze through. If necessary, you can buy this stuff in a sheet of the right thickness, mark it out using a pair of compasses, and then cut it out using a craft knife or strong scissors.