1set GX12 GX16 GX20 Air Aviation Connector 2/3/4/5/6/7/8/9/10/11/12/14/15Pin Core Wire Panel Circular Air Plug Socket Connector Pls notice when you choice "Only Waterproof Cover *make order ,the price only for waterproof cover without any connector . Description: Diameter :12mm/16MM/20MM Environmental conditions Ambient temperature: -50 ~ +70 C Relative humidity: up to 98% at +40 C Atmospheric pressure: up to 4,4 kpa Vibration: vibration frequency 10 ~ 100Hz, acceleration 100m/s2 Impact: Frequency of 60 to 80 beats / min, acceleration of 250m/s2 Centrifugal: acceleration 250m/s2 Main technical characteristics Rated voltage: 2 core /3 core/ 4 core- 400V, 5 pin /6 pin /7 pin /8pin- 250V Rated current: 5A Contact resistance: (each contact pair)Less than 0.005 Insulation resistance: In normal conditions, not less than 1000M; after constant warm tests, not less than 20M. Test voltage: (50Hz, RMS) In normal conditions, 2 core /3 core/ 4 core-1500V, 5pin/ 7pin -1200V, After constant warm test, 2 pin/ 3 pin /4 pin -1200V, 5pin /7pin- 1000V Separation Force: Each single foot separation force is 1-3N, total separation force is one and a half of the upper limit total amount of every single foot separation Force Temperature Rise: at rated load, the contact of the temperature rise should not exceed +50 C ambient temperature Life: after the use of the plugs 500 times, the sockets and outlets should not be damaged.