I screwed the pipes completely into the fittings, but the threads are still visible It is normal, that the threads do not disappear completely. This is due to production reasons. Related articles What diameter do the pipes have? What is the purpose of the oil layer and how do I remove it? Is it really true that the price does not change when I select another size? Does the product have to be attached to the floor? What color do the pipes have? Comments 0 comments Please sign in to leave a comment.