This new LOCOMOTIVE PARTS SUPPLY Rebuild Kit includes all of the essential internals to service one Nathan Airchime P series horn chime: 2 diaphragms, 1 retainer spring, 1 nozzle seat, 1 thin gasket, and 1 thick gasket. Please note, each quantity covers one chime’s internals — for multi-chime horns like the P5, multiple kits are needed (e.g., 5 quantities for a full P5 service). Be sure to order the correct amount for your horn’s size.