One end portion of a downpipe holder has a hook (35) which hooks together with an eccentric (27) at the other end portion (25) of the holder. The holder is then clamped around the downpipe by turning the eccentric. The eccentric is formed by a metal sheet (27) with a circular raised portion (28), the side of which has an S-shaped cross section and is rotatably mounted in said one end portion (25) by being snapped in a circular aperture (26) of this.
