Pres-Vac offers a selection of portable blowers and sampling covers. 

Portable blowers are used to empty a tank of toxic vapor, through a water turbine in the blower, which creates an air flow that forces the toxic vapor out of the tank. 

Sampling covers allow explosion-safe gas freeing during voyage. The cover is opened to allow air to escape from the tank. A wire mesh at the opening of the cover prevents flames from entering the tank.