This is a custom formed 4" x 1" (CxC) copper reducing coupling.
Great for transitioning your 4" copper tube distillation column to a 1" copper pipe tubing condenser.
A tighter fit than most plumbing fittings but you will still need to solder on to copper tubing to insure a seal.
A cost effective alternative to higher priced wrought copper plumbing fittings.
This reducer fitting is intended for use in building your own moonshine still and is not approved for use as a pressure fitting in commercial plumbing systems.

• Fits over standard 4" copper plumbing pipe with 4.125" OD.
  Fits over standard 1" copper plumbing pipe with 1.125" OD.
  Made from heavy .063 thick (14 ga) copper.

Not approved for use as a pressure fitting in commercial plumbing systems.
Matching column sealing sleeve is available in the gasket section.