Made of high-quality materials featuring waterproof and corrosion resistance to long term serve your diesel tank. The whole tank pressure fill cap includes a removable transfer tank vented gas cap and 2-inch heavy-duty cast iron base.

When loosen the cap, the venting pressure tank cap vent pressure inside the tank to outside and release dangerous vapor build up to prevent over-expansion of the fuel tank. And allow air into the diesel transfer tank to prevent vacuum forming and collapse the tank when you draw out fuel.

Works well for ground, farm, commercial and distillate tanks, such as transfer tank, fuel tank, gas tank, diesel tank, auxiliary fuel tank, mobile fuel tank and weather guard tank.

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:
1x Cast Iron Base
1x Removable Transfer Tank Vented Gas Cap