A dip tube (also known as an outage tube) provides vapor space above liquefied gases in a sampling cylinder so that if expansion occurs with an increase in temperature, the pressure is not significantly increased. Basically, the length of the dip tube is used to determine the filling capacity of the cylinder.
This blog post contains detailed instructions on how to select and order an appropriate dip tube. Restek sample cylinder valves can be ordered with or without a dip tube from this page or by contacting our U.S. customer service team or your local Restek representative.
