Reusable nozzle. Black colored UV-resistant foam retains its color and blend into surroundings. Expands to fill gaps and voids. Can be used to replace loose mortar in rock walls and used to direct water flow in pond or waterfall applications. Safe for use around fish or plants. Fills knot holes in trees to seal out pests. Use as a craft foam for artificial plants. Bonds to rock, stone, cement, plastic and wood.