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Message: <blockquote data-quote="Firpo" data-source="post: 3922128" data-attributes="member: 45550"><p>That’s a pretty slick gizmo. I suspect it’s “pinging” the tank similar to how a submarine’s sonar works. Sound travels slower through liquids so it’s been calibrated to act accordingly. FYI it will likely work on any single-walled tank and with any liquid. Don’t have an RV (yet <img class="smilie smilie--emoji" loading="lazy" alt="😬" title="😬" src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f62c.png" />) but I do have several outdoor heaters and grills that all have their own tanks and I just keep an extra. I used to fill my own 20 pound tanks from the 250 gallon tank I have for the house that supplies the range top, two gas fireplaces and my 22KW Generac. When I upsized a few years ago for the genny, the propane dealer got me a rebuilt one from the early 60’s and it happened to have a “nursing” fitting which is connected to a tube that extends to the bottom of the tank where, well, it’s liquid. Unfortunately the NFPA decided we’re all to stupid to fill our own tanks now and made it illegal. Also, if the propane guy ever sees someone hooking a filling hose to that fitting he’s now required to report it and they’ll be put on double timeout top secret probation. Being a law abiding member of society I decided not to ever fill my own tanks again cross my heart. <img class="smilie smilie--emoji" loading="lazy" alt="😉" title="😉" src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f609.png" /><img class="smilie smilie--emoji" loading="lazy" alt="😉" title="😉" src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f609.png" /></p></blockquote><p></p>

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