The Flame King 100 LB Propane Tank is pre-purged vacuum ready for filling of propane avoiding you the cost and headache of purging your new tank. It has a POL valve assembly. It is built from high grade welded steel and powder coated for rust prevention. For your safety, your tank comes with an OPD valve to prevent overfilling as well as x-ray and hydrostatic tested. You can be sure to transport safely both in the US and CA as they are DOT and Transport Canada certified. High grade steel welded propane cylinder POL valve assembly X-ray and hydrostatic tested DOT approved Powder coated for long lasting exterior protection MODEL NO - YSN-100