A United States Navy full pressure suit test kit, measuring approximately 13 x 8.5 x 8, manufactured by the Firewel Company, with a metal parts tag on the top reading: “Test Set, Suit, Full Pressure, Type Mark 1 Mod. 1, Manufacturer’s Part No. F1140000-9, Manufacturer’s Serial No. 538, Contract Order No. N383-90040A.” Inside are two pressure gauges, a suit exhaust connector, oxygen inlet, suit leakage flowmeter, suit leakage valve, control pressure knob, and long connector hoses. In fine condition, with soiling to exterior. The Navy full-pressure suit? for which this tester was used, was a?n early predecessor of? the Project Mercury full-pressure suit. The hose in this tester will fit the Mercury suit connector.