Attention:

Certain features of sigmaaldrich.com will be down for maintenance Saturday afternoon/evening, February 24th starting at 3:00 pm CT until 9:00 pm CT.

Please note that you still have telephone and email access to our local offices. We apologize for any inconvenience.

Gas Line Filter (remove dust and small particles)

Needle valves may become fouled by the presence of dust or particulate matter in a gas stream. To protect any component that has a needle valve incorporated, simply install a small, inexpensive gas line filter directly upstream.