JYINCPED Venting Pressure tank Cap, Protect the Safe for Your Diesel Transfer Fuel Tank Compatible Fit for standard 2" NPT threaded tank bung base. Replace for Dee Zee Fill-Rite transfer tank cap. Works well for ground, farm, commercial and distillate tanks. Great for diesel transfer tanks located outside and added extra security for your fuel. Great for transfer tank, fuel tank, gas tank diesel tank and weather guard tank. Function Keep water and trash out of fuel tank. Prevent leaking and excess gas vapor venting even drive in road. Adjust inner tank pressure due to temperature and fuel consumption. Release dangerous vapor build up to prevent over-expansion of the fuel tank. Allow air into the tank to prevent vacuum forming and collapse the tank when you draw out fuel. Lockable diesel fuel tank cap great for diesel tanks located outside and added extra security for your fuel. Installation Align the vented gas cap with the notch, push down and clockwise twisting to tighten the diesel tank cap all the way. To remove transfer tank cap, counter-clockwise twist slowly to the notch to vent pressure. Push down and twist to lift pressure vent cap and remove. Package Include 1 x Removable transfer tank vented gas cap 1 x 2 Inch Cast iron base