The FIT9-SLIM kit contains all the air line fittings used in an HK9-SLIMLINE Problaster Horn Kit. Includes the following 1/4" NPT fittings: P/N 2151-145 PSI pressure switch, P/N 52175-175 PSI safety valve, P/N 52835-drain cock, P/N 51238 compression fitting, P/N 50040 hex plug. Also includes P/N 318-BK momentary push button and a vial of Juice-1 Thread Sealant.