I believe my tanks had a pressure relief valve. IIRC, it releases at 2500psi. So fill working pressure was 2200psi. In the video, the tank went over 3000psi. Interesting! An auto CNG tank fills to 3500psi or more. So the potential for "excitement" exists if the PRV blows off.
I gave some thought to building an adapter as seen in the video. Ultimately, I decided that having the tanks inspected for integrity ($30) and filled by a pro was money well spent. Compared of course to a local marina who wanted $170 for a single tank exchange. If I filled 4 tanks it got down to $11 each.
I gave some thought to building an adapter as seen in the video. Ultimately, I decided that having the tanks inspected for integrity ($30) and filled by a pro was money well spent. Compared of course to a local marina who wanted $170 for a single tank exchange. If I filled 4 tanks it got down to $11 each.