The FIT34 kit contains all the air line fittings used in an HK3/HK3-1 or HK2/HK2-1 Problaster Horn Kit. Includes the following 1/4" NPT fittings: P/N 2131-130 PSI pressure switch, P/N 52155-155 PSI safety valve, P/N 52835-drain cock, 51414L elbow compression fitting. Also includes P/N 318-BK momentary push button and a vial of Juice-1 Thread Sealant.