The vertical model has a standard copper drainpipe with a vented double wall of rolled and grooved sleeve of sheet copper. The outer housing is PVC with water fittings. Between the sleeve and housings is a single O-ring gasket. The cold water flows along the entire sleeve.

Drainergy: models with transparent housings

The horizontal model has an lower copper concave strip joined and sealed to an upper plastic segment with a grooved second strip for vented double wall. The outer housing is PVC with water fittings in rotatable manifolds. An O-ring gasket seals the fresh water portion.

All materials are commonly available.

Fabrication requires only ordinary tools and skills.

No welding no soldering  no fasteners and no special skills.