EMPTY TANK: Pre-purged vacuum ready for filling with propane; built from high-grade welded steel and powder coated for rust prevention OVERFILL PREVENTION DEVICE: Comes with an OPD valve to prevent overfilling; required by law in most States, if your tank doesn't have this, most places won't fill it! SAFETY: X-ray and hydrostatic tested and DOT and Transport Canada certified so you can be sure to transport safely both in the US and CA SUIT YOUR NEEDS: With a standard-size connection valve, this large 30LB tank will connect as easily as smaller tanks, and work with RVs or trailers, propane tank attachable heaters, and other accessories. LEADING THE INDUSTRY: Flame King, a leader in propane storage solutions, prides itself on making the highest quality, premium, refillable propane tanks on the market. From 1lb up to 100lb tanks, we've got you covered.