10PCS Vanward Gas Water Heater Nozzle Boiler LPG NG Universal Aperture zero 1 1 M6 Fire Nozzle Thread Type: M6 Aperture size: 0 , 1 1 Installation method: outdoors thread con Strong exhaust LPG water heater aperture 0 Strong exhaust NG water heater aperture zero Constant temperature LPG water heater aperture 1 Constant temperature NG water heater aperture 1 Replacement steps: disassemble the fuel appliance, discover the nozzle, investigate the nozzle structure size, as long because the length is the same, the nozzle could be replaced. Note: The alternative assignment calls for auxiliary use of sealant. After installation, examine the air tightness and use it without air leakage.