Abstract: A quick-install assembly for a single control faucet connected to water supply lines that extend through an opening in a deck to which the faucet is mounted, which assembly has a collar of larger diameter than the diameter of the opening of the deck and positioned from above the deck to be disposed at the opening of the deck. The collar has a pair of ears formed thereon that extend over the opening in the deck. A pair of fasteners are operatively engaged from above the deck to be threadedly connected to the ears to be disposed from above through the opening of the deck. A retainer is threadedly connected to the fasteners and includes a pair of swing flaps thereon adapted to be axially shifted toward and away from the collar responsive to the direction of rotation of the fasteners.