we are a licensed cng installer,certifyer,( remember all systems need to be checked every 3 years ), nfpa-52 reg. this is a good bible for cng . we sell parts; ie new tanks, valves, controllers , stainless line, diaphrams,etc, all new.remember a ad on system needs federal,state certification to be legal, and the tanks have a lifecycle; ie its printed on the tank. race7019

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