Elbows up to and including 200Ø are pressed. 250Ø and above are fabricated All standard elbows are ‘half radius’ i.e. a 200Ø B90 would stand 300mm (200Ø + 100mm) plus the collar NB. All elbows are male end and slides inside spiral (female) and does not need a joining collar. If you are fitting elbow to elbow you would require a female collar