Abstract: A clamping device for securing a conduit in close transverse relation to the flat web portion of a C-shaped support channel. The clamping device includes two identical straps each having a curved section for engaging a side of the conduit, a leg extending in depending relation from the curved section, and a fastening flange extending from the opposite side of the curved section. An abutment flange extends from the leg of each strap such that when the straps are in mounted position on opposite sides of the conduit the abutment flanges are positionable in side by side relation and resist outward separation of the legs.