Delta Tetra Single Handle Bathroom Faucet - 589Delta Tetra Single Handle Bathroom Faucet 589 Familiar geometries and subtle curves combine in the Tetra Bath Collection to bring a sleek, architectural look and feel to the bath. Delta faucets with Diamond Seal Technology perform like new for life with a patented design that reduces leak points, is less hassle to install and lasts twice as long as the industry standard. WaterSense labeled faucets use at least 20% less water than the industry standard