It is equipped with asphalt return tube, anti-puffing pressure vent valve, anti-aging overhead nitrogen valve, thermometer, volumeter and output asphalt rapid discharge valve and coupling.

As the guy is not good with his words, this often cause the girl to be very upset. With that & the family's pressure, the girl often vent her anger on him. As for him, he only endure it in silence.

Because they lost power to the water cooling system, they needed to vent the pressure that's building up inside.