I used to know a guy that worked at a mechanical shop that specialized in CNG and LPG conversions for fleets. He would actually get people coming in that had either just bought a house in the area, or perhaps an older person whose spouse had passed away, and found themselves with a CNG pump in their yard that they would never use and just wanted to get rid of it! They were usually willing to pay to have it removed, they just didn't know where to go to get it done. He wouldn't charge them anything, then go in after work and remove it, have the line capped etc. Man I wish I had people coming into my work and offering me $6000 items for free if I was willing to come and pick it up!