Abstract: A method of clamping a conduit comprising a cylindrical conduit (tube or pipe) to an aperture in a rigid barrier by steps of providing a clamp with a wide plate with a peripheral flange on an obverse end and a narrower boss back surface on an opposite end and with a central hole extending through the plate and the boss, and with a radial slot extending outwardly from a central hole to peripheral edges of both the plate and the boss. The clamp is installed onto a pipe or conduit by inserting a wedge into the radial slot; sliding the clamp onto the tube pipe until it is in contact with a rigid barrier; affixing the clamp to the rigid barrier with adhesive or fasteners; and removing the wedge from the radial slot.