I believe the two chrome pipes in the photo are used in plumbing.
They are 1 1/4" (32mm) diameter and around 6" long. The flange at the end slips over pipe with the same diameter (1 1/4) and I believe they have a thread at the flange end which has been cut off for use in the application shown. I am advised these pipes may be some under sink joint of some type.
Please ignore the 45 degree cut at the end these has been cut this way for the present use (motorcycle exhaust extensions) which are home made.
Photo here: