rubber seal application_number US 57717709 A description the present invention is a pipe coupling which forms a sealed joint between two concentric pipes in particular the present device is used for connecting a new pipe to an existing drain pipe of the type generally found on the roof tops as fig1 3 show the present invention is comprised of two solid tubular cylindrical bodies 1 and 4 an elastic tubular body 7 of rubber or similar material and a ring 6 to prevent the elastic material to grip and rotate with the rotating body 1 the tubular bodies 1 and 4 can be connected to each other by means of threads to form an articulated housing one end of the tubular body 1 has a collar 2 this collar is shaped as a castle head the castle head shape allows for an easy access to the head using an appropriately shaped tool 8 as shown in fig4 however any other shape may be used to provide a mating head for the tightening tool 8 at the opposite end the tubular body 1 consists of fastening threads 3 on the external side of its cylindrical surface the tubular body 4 has an internal diameter slightly larger than the outer diameter of the tubular body 1 at one end of the body 4 is a collar 5 part of the inner surface of the tubular body 4 consists of fastening threads appropriately sized to mate with the external threads 3 of the body 1 a tubular elastic body 7 of internal diameter larger than the tubular bodies 1 and 4 made of rubber or similar material natural or synthetic a fluid impermeable compressible elastomeric material preferably of neoprene elastomers.