The regulator did not see much use. I am selling for a family member. They used it to test the propane equipment in used houses that had a propane hookup but no propane tanks installed. Has not been used in at least 10 years. Its got 3 markings on it LV404B9 - LV 4403 - 01D16. See pics. Comes as seen in pics. Any questions just ask. Working order.