The air gap uses the atmosphere to protect from the reversal of contaminants. The solid brass construction of the headpiece insures reliability and durability. Polished Chrome Finish. Air Gap With Non Metallic Cap. Perfectly Match with Kingston Brass Finish. Polished Chrome. Engineering Grade ABS Construction. 5/8" x 7/8". Spray Nozzles:. Finish: Chrome. Material: Plastic. Style: Contemporary / Modern. Dimensions:. Width: 3.5. Length: 26.5. Height: 8