Watts Top Quality Designer Faucets are fully assembled for easy installation. Top mount design reduces installation labor and means you'll never need to crawl below the sink again. Lead-Free* (components are stainless steel or non-metallic), ceramic disc for durability, and Quick-Connect fittings for all tubes including air gap. One style works for both air gap and non-air gap installations. Models with filter change monitors are available to remind customers when to change cartridges for water quality assurance.