These are an ideal air source solution for any air suspension kit, air horns or your on-the-go pneumatic needs. The kit includes two air compressors with standard ¼” stainless steel braided hoses and ¼” NPT in-line check valves, two heavy duty 40A relays with pre-wired plugs, pressure switch, premium in-line 60A fuse with waterproof holder, two 30A in-line fuses and mounting hardware.