Let no bad gas pass
It may not be made by Westinghouse, but you can be sure of your air, nitrox or mixed gas if you carry this $249, Coltri Sub personal air filter. Before you fill your tank, you attach this personal filter between the fillstation line and your tank. The replaceable triplex filter removes oil, water, hydrocarbons, taste and carbon monoxide from the gas as it passes into your tank. We wonder if the the air between you and dive shop owner may get stale when he realizes that you don’t trust him to give you a clean fill.