A product dispenser, such as for dispensing napkins, designed to be recessed in a countertop or wall, includes an elongated housing or chute for holding product, a faceplate assembly, and a collar for mounting the dispenser to the countertop or wall. The collar includes a locking arrangement for securing the collar in place without requiring any tools. The locking arrangement includes a thumb screw having a threaded shaft with a first end and a second end, a wing nut at the first end, and a flap at the second end. As the wing nut is rotated in a first direction, the flap is drawn upward until it engages a stop surface, such as the underside of the countertop or inside surface of a wall.