Interface of refrigerant pipe opening can be M14 or 1/2" thread. If you use other inspection tools, please check whether the hole of the screwdriver and the hole of the refrigerant cylinder are compatible. durable. Function: Additional cooling kit for air conditioning. The R134 interface is easy to use and install. High pressure hose with 1/2 inch ACME connection. Built-in safety valve prevents accidental release of refrigerant. By adding refrigerant, it is suitable for home and automotive air conditioners. Technical data: Material: aluminum + copper + rubber Quantity: 1 Refrigerant: R134A Speaker: 1 * refrigerant pipe measurement kit Various brands of refrigerant filling kits The following method is: 1. It is necessary to prepare an additional tube for self-checking the car air conditioner. 2. Vehicle-mounted R134 refrigerant bottle. 3. Now start testing the pressure in your car: First use the snap-on device to twist the sleeve at the end of the DIY filler tube clockwise to achieve At the very top, screw the refrigerant bottle into the cap and tighten it. 4. Identify the low voltage interface. Usually there is a small blue or black cap on the left side of the cover, To tighten (low pressure cover), please unscrew the small cover. 5. Start the car engine, then turn on the AC switch of the air conditioner, fully turn on the fan, turn it on, and wait for three minutes. Connect the DIY interface to the car air conditioner low voltage. 6. After connecting the DIY hose to the low pressure port, the scale indication on the DIY pressure gauge will appear immediately. Currently on the DIY group The pressure gauge scale corresponds to the pressure in the air conditioning system. For an overview of the system, see the pressure scale on the manometer. Negative pressure. At what pressure should the refrigerant be added? There is currently a knowledge statement The pressure in the control system changes with the change in the temperature of the external environment, as shown in the figure below below, temperature and air are in Fahrenheit Adjust the system pressure comparison chart to confirm the system pressure. Higher system pressure indicates the system has cooled If the refrigerant is higher than normal, it needs to be refilled. Outdoor ambient temperature pressure (Fahrenheit temperature) with low pressure measurement pressure, the following dynamometer value is the theoretically constant temperature in the laboratory The outside temperature during use cannot meet this requirement. When the owner and his friends use it Please calculate according to the minimum value in the table calculation method, then subtract 10PSI from the minimum value. When the system is under normal pressure, the pressure cannot exceed the minimum value. When the pressure is exceeded, the compressor will be automatically protected During this period, the cooling effect will be small For example, when the outdoor temperature is 30 degrees, the home electric meter shows 45PSI-55PSI, This is a constant temperature value, should we to use 45PSImus1OP in the calculation? If it is the pressure, the result is 35ESI, This is the normal pressure in the system, it is better not to exceed this value. Shop Tips: 1. The size is manually measured, please allow the error (1-3cm). 2. Due to different monitor pixels, there may be color difference, please refer to the actual product.