The Westbrass air gap protects potable water from contamination by preventing dirty dishwasher water from overflowing into your main water lines, as required by code in many states. This replacement cap is available in a variety of finishes to stylize your kitchen sink and complement your other decorative fixtures. Skirted air gap cap only 1-3/4 in. diameter 2-3/4 in. height Fits all standard air Designed by Westbrass, the Westbrass Skirted Brass Air Gap Cap Only in Satin Nickel is built for lasting quality and everyday use. Shop at OJCommerce and explore our collection with free shipping on every order.