Sold as a replacement to your existing air switch to any units with a 1/4" hose connection Safe, low profile air switch to operate your garbage disposal High quality brass air switch button cover and body Button size: (L)1-3/4" x (W)1-3/4" x (H)3-3/4" Includes 39-3/8" plastic hose Corrosion-resistant finish Designed for long-lasting durability Needs PMD401 power module or similar