Flame King YSN230 Steel Propane Cylinder with Overflow Protection Device Valve and Built-in Gauge, 20-Pound Never run out of propane; Flame King 20-Pound Steel Propane Cylinder with Type 1 Overflow Protection Device Valve and Built-in accurate gauge High grade steel welded construction Premium OPD valve assembly; Dot Approved Powder coated for long lasting exterior protection X-ray and hydrostatic tested