Is this the type of fitting?These are what was on my 248. Our local store keeps them on the shelf with the assortment of other fittings. They are a goofy compression fitting. They slide onto the tubing and you push the tubing into the recieving fitting and tighten the nut. This very slightly crimps the end of the tube so the tube wont slide out, but its not the greatest of seals. They can be loosened and tightened again, but after several times they dont make a very tight seal.
Jeff