Designed for use with Purist, Stillness, Margaux, Kelston and Composed bath fillers, this mounting-block installs into the wood or concrete subfloor to firmly anchor the bath filler faucet. Kohler® Mounting Block, For Use with: Purist®, Stillness®, Margaux® and Kelston® Freestanding Bath Fillers, 4-11/16 in L x 2-1/4 in H